Question 1: Palette 1/175

NEET 2026 MCQ

$ \text { Match List I with List II : } $

List-I (Phase of cell cycle)		List-II (Activity)
A.	Incomplete dominance	I.	Human skin colour
B.	Co-dominance	II.	Inheritance of flower colour in Antirrhinum sp.
C.	Pleiotropy	III.	Phenylketonuria disease in humans
D.	Polygenic inheritance	IV.	ABO blood groups

Choose the correct answer from the options given below :

A

A-II, B-IV, C-III, D-I

B

A-I, B-III, C-II, D-IV

C

A-I, B-IV, C-III, D-II

D

A-II, B-I, C-III, D-IV

Question 2: Palette 2/175

NEET 2026 MCQ

Which of the following statements are true with reference to the sex-determination in honeybees?

A. An offspring formed from the union of a sperm and an egg, develops as a female (queen or worker).

B. An unfertilized egg develops as a male by parthenogenesis.

C. A male has half the number of chromosomes than that of a female.

D. Males produce sperms by meiosis.

E. Honeybees have a haplodiploid sex-determination system.

Choose the correct answer from the options given below :

A

A, B, C and E only

B

B, C, D and E only

C

A, B, C and D only

D

A, B, D and E only

Question 3: Palette 3/175

NEET 2026 MCQ

Which one of the following disorders is caused by the substitution of Glutamic acid (Glu) by Valine (Val) at the sixth position of the beta globin chain of the haemoglobin molecule?

A

Thalassemia

B

Sickle-cell anaemia

C

Phenylketonuria

D

Haemophilia

Question 4: Palette 4/175

NEET 2026 MCQ

What is the probability of having children with 'O' blood group, where both mother and father are heterozygous for ' $\underline{\mathrm{A}}$ ' and ' $\underline{\mathrm{B}}$ ' blood group, respectively?

A

$25 \%$

B

$0 \%$

C

$75 \%$

D

$50 \%$

Question 5: Palette 5/175

NEET 2026 MCQ

In a population of a grasshopper species, the chromosome number of some members is 23 and some other members possess 24 chromosomes. The 23 and 24 chromosome-bearing members in this species are $\_\_\_\_$ .

A

females and males, respectively

B

all males

C

males and females, respectively

D

all females

Question 6: Palette 6/175

NEET 2026 MCQ

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : In an experiment, Mendel observed that the F1 progeny plants are all tall and none are dwarf.

Reason R : Stem height is a contrasting trait, with tall being dominant and dwarf being recessive.

In the light of the above statements, choose the most appropriate answer from the options given below :

A

$\mathbf{A}$ is not correct but $\mathbf{R}$ is correct

B

Both $\mathbf{A}$ and $\mathbf{R}$ are correct and $\mathbf{R}$ is the correct explanation of $\mathbf{A}$

C

Both $\mathbf{A}$ and $\mathbf{R}$ are correct but $\mathbf{R}$ is not the correct explanation of $\mathbf{A}$

D

$\mathbf{A}$ is correct but $\mathbf{R}$ is not correct

Question 7: Palette 7/175

NEET 2026 MCQ

For a person with blood group 'O', which of the following is not a possible combination of parents' blood group genotypes?

A

Father : $I^A I^B$ and Mother : $I^A i$

B

Father : $A_i$ and Mother : $A_i$

C

Father : $A_i$ and Mother : $A_i$

D

Father : $I B i$ and Mother : $I B i$

Question 8: Palette 8/175

NEET 2026 MCQ

Given below are two statements :

Statement I : Down's syndrome is caused by the absence of one of the X-chromosomes.

Statement II : Turner's syndrome is caused by the presence of an additional copy of the chromosomes.

In the light of the above statements, choose the correct answer from the options given below:

A

Statement I is incorrect but Statement II is correct

B

Both Statement I and Statement II are correct

C

Both Statement I and Statement II are incorrect

D

Statement I is correct but Statement II is incorrect

Question 9: Palette 9/175

NEET 2025 MCQ

What is the pattern of inheritance for polygenic trait?

A

Autosomal dominant pattern

B

X-linked recessive inheritance pattern

C

Mendelian inheritance pattern

D

Non-mendelian inheritance pattern

Question 10: Palette 10/175

NEET 2025 MCQ

With the help of given pedigree, find out the probability for the birth of a child having no disease and being a carrier (has the disease mutation in one allele of the gene) in $F_3$ generation.

A

$1 / 8$

B

Zero

C

$1 / 4$

D

$1 / 2$

Question 11: Palette 11/175

NEET 2025 MCQ

Genes $R$ and $Y$ follow independent assortment. If RRYY produce round yellow seeds and rryy produce wrinkled green seeds, what will be the phenotypic ratio of the F2 generation?

A

Phenotypic ratio - $9: 3: 3: 1$

B

Phenotypic ratio - $9:7$

C

Phenotypic ratio - $1:2:1$

D

Phenotypic ratio - $3: 1$

Question 12: Palette 12/175

NEET 2024 MCQ

Given below are two statements:

Statement I: When many alleles of a single gene govern a character, it is called polygenic inheritance.

Statement II: In Polygenic inheritance, the effect of each allele is additive.

In the light of the above statements, choose the correct answer from the options given below.

A

Statement I is true but Statement II is false

B

Statement I is false but Statement II is true

C

Both Statement I and Statement II are true

D

Both Statement I and Statement II are false

Question 13: Palette 13/175

NEET 2024 MCQ

Match List-I with List-II:

	List - I Type of Inheritance		List - II Example
(A)	Incomplete dominance	(I)	Blood groups in human
(B)	Co-dominance	(II)	Flower colour in Antirrhinum
(C)	Pleiotropy	(III)	Skin colour in human
(D)	Polygenic inheritance	(IV)	Phenylketonuria

Choose the correct answer from the options given below:

A

A-III, B-IV, C-II, D-I

B

A-II, B-I, C-IV, D-III

C

A-II, B-III, C-I, D-IV

D

A-IV, B-I, C-III, D-II

Question 14: Palette 14/175

NEET 2024 MCQ

When a tall pea plant with round seeds was selfed, it produced the progeny of :

(a) Tall plants with round seeds and

(b) Tall plants with wrinkled seeds.

Identify the genotype of the parent plant.

A

TtRr

B

TtRR

C

TTRR

D

TTRr

Question 15: Palette 15/175

NEET 2024 MCQ

Aneuploidy is a chromosomal disorder where chromosome number is not the exact copy of its haploid set of chromosomes, due to :

A. Substitution

B. Addition

C. Deletion

D. Translocation

E. Inversion

Choose the most appropriate answer from the options given below :

A

C and D only

B

D and E only

C

A and B only

D

B and C only

Question 16: Palette 16/175

NEET 2024 MCQ

The mother has $\mathrm{A}+$ blood group the father has $\mathrm{B}+$ and the child is $\mathrm{A}+$. What can be the possibility of genotypes of all three, respectively?

A. $I^A I^A|I B i| I^B i$

B. $I^A I^A\left|I^B i\right| I^A i$

C. $I^B i\left|I^A I^A\right| I^A I^B$

D. $\left|A \beta^A\right| I^B I^B \mid I^A i$

E. $I^A i\left|I^B i\right| I^A i$

Choose the correct answer from the option given below:

A

C and D

B

D and A

C

A and B

D

B and E

Question 17: Palette 17/175

NEET 2024 MCQ

Which one of the following can be explained on the basis of Mendel's Law of Dominance?

A. Out of one pair of factors one is dominant and the other is recessive.

B. Alleles do not show any expression and both the characters appear as such in F$_2$ generation.

C. Factors occur in pairs in normal diploid plants.

D. The discrete unit controlling a particular character is called factor.

E. The expression of only one of the parental characters is found in a monohybrid cross.

Choose the correct answer from the options given below:

A

A, B and C only

B

A, C, D and E only

C

B, C and D only

D

A, B, C, D and E

Question 18: Palette 18/175

NEET 2024 MCQ

A pink flowered Snapdragon plant was crossed with a red flowered Snapdragon plant. What type of phenotype/s is/are expected in the progeny?

A

Only red flowered plants

B

Red flowered as well as pink flowered plants

C

Only pink flowered plants

D

Red, Pink as well as white flowered plants

Question 19: Palette 19/175

NEET 2024 MCQ

In a plant, black seed color $(\mathrm{BB} / \mathrm{Bb})$ is dominant over white seed color $(\mathrm{bb})$. In order to find out the genotype of the black seed plant, with which of the following genotype will you cross it?

A

$\mathrm{BB}$

B

$\mathrm{bb}$

C

$\mathrm{Bb}$

D

$\mathrm{BB} / \mathrm{Bb}$

Question 20: Palette 20/175

NEET 2024 MCQ

Match List I with List II

	List - I		List - II
A.	Two or more alternative forms of a gene	I.	Back cross
B.	Cross of F$_1$ progeny with homozygous recessive parent	II.	Ploidy
C.	Cross of F$_1$ progeny with any of the parents	III.	Allele
D.	Number of chromosome sets in plant	IV.	Test cross

Choose the correct answer from the options given below:

A

A-I, B-II, C-III, D-IV

B

A-II, B-I, C-III, D-IV

C

A-III, B-IV, C-I, D-II

D

A-IV, B-III, C-II, D-I

Question 21: Palette 21/175

NEET 2024 MCQ

As per ABO blood grouping system, the blood group of father is $\mathrm{B}^{+}$, mother is $\mathrm{A}^{+}$ and child is $\mathrm{O}^{+}$. Their respective genotype can be

A. I^Bi/I^Ai/ii

B. I^BI^B/I^AI^A/ii

C. iI^B/iI^A/I^AIB

D. I^Ai/I^Bi/I^Ai

E. iI^B/iI^A/I^AI^B

Choose the most appropriate answer from the options given below :

A

A only

B

B only

C

C & B only

D

D & E only

Question 22: Palette 22/175

NEET 2023 MCQ

Match List - I with List - II.

	List - I		List - II
(A)	Monohybrid Cross	(I)	1 : 1
(B)	Dihybrid Cross	(II)	1 : 2 : 1
(C)	Incomplete dominance	(III)	3 : 1
(D)	Test Cross	(IV)	9 : 3 : 3 : 1

Choose the correct answer from the options given below :

A

(A)-(III), (B)-(IV), (C)-(II), (D)-(I)

B

(A)-(II), (B)-(IV), (C)-(III), (D)-(I)

C

(A)-(II), (B)-(III), (C)-(IV), (D)-(I)

D

(A)-(IV), (B)-(III), (C)-(I), (D)-(II)

Question 23: Palette 23/175

NEET 2023 MCQ

A heterozygous pea plant with violet flowers was crossed with homozygous pea plant with white flower. Violet is dominant over white. Which one of the following represents the expected combinations among 40 progenies formed?

A

30 produced violet and 10 produced white flowers

B

20 produced violet and 20 produced white flowers

C

All 40 produced violet flowers

D

All 40 produced white flowers

Question 24: Palette 24/175

NEET 2023 MCQ

In which disorder change of single base pair in the gene for beta globin chain results in change of glutamic acid to valine ?

A

Thalassemia

B

Sickle cell anemia

C

Haemophilia

D

Phenylketonuria

Question 25: Palette 25/175

NEET 2023 MCQ

A certain plant homozygous for yellow seeds and red flowers was crossed with a plant homozygous for green seeds and white flowers. The F₁ plants had yellow seeds and pink flowers. The F₁ plants were selfed to get F₂ progeny. Assuming independent assortment of the two characters, how many phenotypic categories are expected for these characters in the F₂ generation ?

A

9

B

16

C

4

D

6

Question 26: Palette 26/175

NEET 2023 MCQ

Select the correct statement/s with respect to mechanism of sex determination in Grasshopper.

(A) It is an example of female heterogamety.

(B) Male produces two different types of gametes either with or without X chromosome.

(C) Total number of chromosomes (autosomes and sex chromosomes) is same in both males and females.

(D) All eggs bear an additional X chromosome besides the autosomes.

Choose the correct answer from the options given below :

A

(B) and (D) only

B

(A), (C) and (D) only

C

(A) only

D

(A) and (C) only

Question 27: Palette 27/175

NEET 2023 MCQ

Frequency of recombination between gene pairs on same chromosome as a measure of the distance between genes to map their position on chromosome, was used for the first time by

A

Sutton and Boveri

B

Alfred Sturtevant

C

Henking

D

Thomas Hunt Morgan

Question 28: Palette 28/175

NEET 2023 MCQ

The phenomenon of pleiotropism refers to

A

Presence of two alleles, each of the two genes controlling a single trait

B

A single gene affecting multiple phenotypic expression

C

More than two genes affecting a single character

D

Presence of several alleles of a single gene controlling a single crossover

Question 29: Palette 29/175

NEET 2023 MCQ

Which of the following statements are correct about Klinefelter’s Syndrome?

A. This disorder was first described by Langdon Down (1866).

B. Such an individual has overall masculine development. However, the feminine development is also expressed.

C. The affected individual is short statured.

D. Physical, psychomotor and mental development is retarded.

E. Such individuals are sterile.

Choose the correct answer from the options given below :

A

C and D only

B

B and E only

C

A and E only

D

A and B only

Question 30: Palette 30/175

NEET 2023 MCQ

Broad palm with single palm crease is visible in a person suffering from-

A

Turner’s syndrome

B

Klinefelter’s syndrome

C

Thalassemia

D

Down’s syndrome

Question 31: Palette 31/175

NEET 2023 MCQ

Which one of the following symbols represents mating between relatives in human pedigree analysis?

A

B

C

D

Question 32: Palette 32/175

NEET 2022 MCQ

Given below are two statements:

Statement I : Sickle cell anaemia and haemophilia are autosomal dominant traits.

Statement II : Sickle cell anaemia and haemophilia are disorders of the blood.

In the light of the above statements, choose the correct answer from the options given below :

A

Statement I is incorrect but Statement II is correct

B

Both Statement I and Statement II are correct

C

Both Statement I and Statement II are incorrect

D

Statement I is correct but Statement II is incorrect

Question 33: Palette 33/175

NEET 2022 MCQ

In meiosis, crossing over and exchange of genetic material between homologous chromosomes are catalyzed by the enzyme

A

Polymerase

B

Phosphorylase

C

Recombinase

D

Transferase

Question 34: Palette 34/175

NEET 2022 MCQ

The chromosomal theory of inheritance was proposed by

A

Robert Brown

B

Thomas Morgan

C

Sutton and Boveri

D

Gregor Mendel

Question 35: Palette 35/175

NEET 2022 MCQ

What is the expected percentage of F₂ progeny with yellow and inflated pod in dihybrid cross experiment involving pea plants with green coloured, inflated pod and yellow coloured constricted pod?

A

9%

B

100%

C

56.25%

D

18.75%

Question 36: Palette 36/175

NEET 2022 MCQ

If a female individual is with small round head, furrowed tongue, partially open mouth and broad palm with characteristic palm crease. Also the physical, psychomotor and mental development is retarded. The karyotype analysis of such an individual will show :

A

Trisomy of chromosome 21

B

47 chromosomes with XXY sex chromosomes

C

45 chromosomes with XO sex chromosomes

D

47 chromosomes with XYY sex chromosomes

Question 37: Palette 37/175

NEET 2022 MCQ

Select the incorrect match regarding the symbols used in the Pedigree analysis:

A

B

C

D

Question 38: Palette 38/175

NEET 2022 MCQ

A normal girl, whose mother is haemophilic marries a male with no ancestral history of haemophilia. What will be the possible phenotypes of the offspring?

(a) Haemophilic son and haemophilic daughter.

(b) Haemophilic son and carrier daughter.

(c) Normal daughter and normal son.

(d) Normal son and haemophilic daughter.

Choose the most appropriate answer from the options given below:

A

(b) and (d) only

B

(a) and (b) only

C

(b) and (c) only

D

(a) and (d) only

Question 39: Palette 39/175

NEET 2022 MCQ

XO type of sex determination can be found in :

A

Drosophila

B

Birds

C

Grasshoppers

D

Monkeys

Question 40: Palette 40/175

NEET 2022 MCQ

Given below are two statements:

Statement I : Mendel studied seven pairs of contrasting traits in pea plants and proposed the Laws of Inheritance.

Statement II : Seven characters examined by Mendel in his experiment on pea plants were seed shape and colour, flower colour, pod shape and colour, flower position and stem height.

In the light of the above statements, choose the correct answer from the options given below :

A

Both Statement I and Statement II are correct

B

Both Statement I and Statement II are incorrect

C

Statement I is correct but Statement II is incorrect

D

Statement I is incorrect but Statement II is correct

Question 41: Palette 41/175

NEET 2022 MCQ

Which of the following occurs due to the presence of autosome linked dominant trait?

A

Sickle cell anaemia

B

Myotonic dystrophy

C

Haemophilia

D

Thalessemia

Question 42: Palette 42/175

NEET 2022 MCQ

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Mendel's law of independent assortment does not hold good for the genes that are located closely on the same chromosome.

Reason (R) : Closely located genes assort independently.

In the light of the above statements, choose the correct answer from the options given below :

A

Both (A) and (R) are correct and (R) is the correct explanation of (A)

B

Both (A) and (R) are correct but (R) is not the correct explanation of (A)

C

(A) is correct but (R) is not correct

D

(A) is not correct but (R) is correct

Question 43: Palette 43/175

NEET 2022 MCQ

If a colour blind female marries a man whose mother was also colour blind, what are the chances of her progeny having colour blindness?

A

25%

B

50%

C

75%

D

100%

Question 44: Palette 44/175

NEET 2022 MCQ

The recombination frequency between the genes a & c 5&, b & c is 15%, b & d is 9%, a & b is 20%, c & d is 25% and a & d is 29%. What will be the sequence of these genes on a linear chromosome?

A

a, d, b, c

B

d, b, a, c

C

a, b, c, d

D

a, c, b, d

Question 45: Palette 45/175

NEET 2021 MCQ

The production of gametes by the parents, formation of zygotes, the F₁ and F₂ plants, can be understood from a diagram called :

A

Net square

B

Bullet square

C

Punch square

D

Punnett square

Question 46: Palette 46/175

NEET 2021 MCQ

Now-a-days it is possible to detect the mutated gene causing cancer by allowing radioactive probe to hybridise its complimentary DNA in a clone of cells, followed by its detection using autoradiography because:

A

mutated gene does not appear on photographic film as the probe has complementarity with it

B

mutated gene partially appears on a photographic film

C

mutated gene completely and clearly appears on a photographic film

D

mutated gene does not appear on a photographic film as the probe has no complementarity with it

Question 47: Palette 47/175

NEET 2021 MCQ

In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased?

A

100%

B

50%

C

75%

D

25%

Question 48: Palette 48/175

NEET 2020 MCQ

Experimental verification of the chromosomal theory of inheritance was done by

A

Sutton

B

Mendel

C

Morgan

D

Boveri

Question 49: Palette 49/175

NEET 2020 MCQ

Select the correct match

A

Thalassemia – X linked

B

Sickle cell anaemia – Autosomal recessive trait, chromosome-11

C

Phenylketonuria – Autosomal dominant trait

D

Haemophilia – Y linked

Question 50: Palette 50/175

NEET 2020 MCQ

How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits?

A

14

B

4

C

2

D

8

Question 51: Palette 51/175

NEET 2019 MCQ

A gene locus has two alleles A, a. If the frequency of dominant allele A is 0.4, then what will be the frequency of homozygous dominant, heterozygous and homozygous recessive individuals in the population?

A

0.16(AA); 0.48 (Aa); 0.36(aa)

B

0.16 (AA); 0.36(Aa); 0.48(aa)

C

0.36 (AA); 0.48 (Aa); 0.16 (aa)

D

0.16 (AA); 0.24 (Aa); 0.36 (aa)

Question 52: Palette 52/175

NEET 2019 MCQ

What is the genetic disorder in which an individual has an overall masculine development, gynaecomastia, and is sterile?

A

Edward syndrome

B

Down’s syndrome

C

Turner’s syndrome

D

Klinefelter’s syndrome

Question 53: Palette 53/175

NEET 2019 MCQ

What map unit (Centimorgan) is adopted in the construction of genetic maps?

A

A unit of distance between genes on chromosomes, representing 1% cross over.

B

A unit of distance between genes on chromosomes, representing 50% cross over.

C

A unit of distance between two expressed genes, representing 10% cross over.

D

A unit of distance between two expressed genes, representing 100% cross over.

Question 54: Palette 54/175

NEET 2019 MCQ

In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F₁ generation, pink flowers were obtained. When pink flowers were selfed, the F₂ generation showed white, red and pink flowers. Choose the incorrect statement from the following :

A

Ratio of F₂ is ${1 \over 4}$ (Red) : ${2 \over 4}$ (Pink) : ${1 \over 4}$ (White)

B

Law of Segregation does not apply in this experiment

C

This experiment does not follow the Principle of Dominance

D

Pink colour in F₁ is due to incomplete dominance

Question 55: Palette 55/175

NEET 2019 MCQ

The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by :

A

Alfred Sturtevant

B

Gregor J. Mendel

C

Sutton Boveri

D

T.H. Morgan

Question 56: Palette 56/175

NEET 2019 MCQ

Select the incorrect statement.

A

In domesticated fowls, sex of progeny depends on the type of sperm rather than egg.

B

Human males have one of their sex-chromosome much shorter than the other.

C

Male fruit fly is heterogametic

D

In male grasshoppers, 50% of sperms have no sex-chromosome.

Question 57: Palette 57/175

NEET 2018 MCQ

Which of the following pairs is wrongly matched?

A

Starch synthesis in pea : Multiple alleles

B

ABO blood grouping : Co-dominance

C

XO type sex determination: Grasshopper

D

T.H. Morgan : Linkage

Question 58: Palette 58/175

NEET 2018 MCQ

A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by

A

only daughters

B

only sons

C

only grandchildren

D

both sons and daughters

Question 59: Palette 59/175

NEET 2018 MCQ

Which of the following characteristics represent 'Inheritance of blood groups' in humans?
a. Dominance
b. Co-dominance
c. Multiple allele
d. Incomplete dominance
e. Polygenic inheritance

A

b, c and e

B

a, b and c

C

b, d and e

D

a, c and e

Question 60: Palette 60/175

NEET 2017 MCQ

A disease caused by an autosomal primary non-disjunction is :

A

Klinefelter's Syndrome

B

Down's Syndrome

C

Turner's Syndrome

D

Sickle Cell Anemia

Question 61: Palette 61/175

NEET 2017 MCQ

Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement.

A

Both are due to a qualitative defect in globin chain synthesis

B

Thalassemia is due to less synthesis of globin molecules

C

Sickle cell anemia is due to a quantitative problem of globin molecules

D

Both are due to a quantitative defect in globin chain synthesis

Question 62: Palette 62/175

NEET 2017 MCQ

Which one from those given below is the period for Mendel’s hybridisation experiments ?

A

1870 – 1877

B

1857 – 1869

C

1840 – 1850

D

1856 – 1863

Question 63: Palette 63/175

NEET 2017 MCQ

Among the following characters, which one was not considered by Mendel in his experiments on pea?

A

Stem-Tall or dwarf

B

Pod-Inflated or constricted

C

Trichomes-Glandular or non-glandular

D

Seed-Green or yellow

Question 64: Palette 64/175

NEET 2017 MCQ

The genotypes of a Husband and Wife are I^AI^B and I^Ai.
Among the blood types of their children, how many different genotypes and phenotypes are possible?

A

4 genotypes ; 3 phenotypes

B

4 genotypes ; 4 phenotypes

C

3 genotypes ; 4 phenotypes

D

3 genotypes ; 3 phenotypes

Question 65: Palette 65/175

NEET 2016 MCQ

The mechanism that causes a gene to move from one linkage group to another is called

A

crossing-over

B

translocation

C

duplication

D

inversion

Question 66: Palette 66/175

NEET 2016 MCQ

If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is

A

0.75

B

0.5

C

0

D

1

Question 67: Palette 67/175

NEET 2016 MCQ

Pick out the correct statements :
(a) Haemophilia is a sex-linked recessive disease.
(b) Down's syndrome is due to aneuploidy.
(c) Phenylketonuria is an autosomal recessive gene disorder.
(d) Sickle cell anaemia is an X – linked recessive gene disorder.

A

(a), (b) and (c) are correct

B

(a), (c) and (d) are correct.

C

(a) and (d) are correct

D

(b) and (d) are correct.

Question 68: Palette 68/175

NEET 2016 MCQ

A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is contaning more number of chromosomes as compared to other dividing cells. This would results in -

A

Polyteny

B

Aneuploidy

C

Polyploidy

D

Somaclonal variation

Question 69: Palette 69/175

NEET 2016 MCQ

Match the terms in Column-I with their description in Column-II and choose the correct option :

Column-I	Column-II
(a) Dominance	(i) Many genes govern a single character
(b) Codominance	(ii) In a heterozygous organism only one allele expresses itself
(c) Pleiotropy	(iii) In a heterozygous organism both alleles express themselves fully
(d) Polygenic inheritance	(iv) A single gene influences many characters

A

(a) - (ii), (b) - (iii), (c) - (iv), (d) - (i)

B

(a) - (iv), (b) - (i), (c) - (ii), (d) - (iii)

C

(a) - (ii), (b) - (ii), (c) - (iv), (d) - (iii)

D

(a) - (iv), (b) - (iii), (c) - (i), (d) - (ii)

Question 70: Palette 70/175

NEET 2016 MCQ

Which of the following most appropriately describes haemophilia ?

A

Chromosomal disorder

B

X-linked recessive gene disorder

C

Dominant gene disorder

D

Recessive gene disorder

Question 71: Palette 71/175

NEET 2016 MCQ

In a testcross involving F₁ dihybrid flies, more parental-type offspring were produced than the recombinant-typeoffspring. This indicates

A

Both of the characters are controlled by more than one gene

B

The two genes are linked and present on the same chromosome

C

The two genes are located on two different chromosomes

D

Chromosomes failed to separate during meiosis

Question 72: Palette 72/175

NEET 2016 MCQ

A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F₁ plants were selfed the resulting genotypes were in the ratio of -

A

3 : 1 :: Tall : Dwarf

B

1 : 2 : 1 :: Tall heterozygous : Tall homozygous : Dwarf

C

1 : 2 : 1 :: Tall homozygous : Tall heterozygous : Dwarf

D

3 : 1 :: Dwarf : Tall

Question 73: Palette 73/175

NEET 2015 MCQ

A pleiotropic gene -

A

is a gene evolved during Pliocene

B

is expressed only in primitive plants

C

Controls multiple traits in an individual

D

controls a trait only in combination with anther gene

Question 74: Palette 74/175

NEET 2015 MCQ

A gene showing codominance has :

A

alleles tightly linked on the same chromosome

B

one allele dominant on the other

C

both alleles independently expressed in the heterozygote

D

alleles that are recessive to each other

Question 75: Palette 75/175

NEET 2015 MCQ

In his classic experiments on pea plants, Mendel did not use :

A

Seed colour

B

Flower position

C

Seed shape

D

Pod length

Question 76: Palette 76/175

NEET 2015 MCQ

The term "linkage" was coined by -

A

G. Mendel

B

T.H. Morgan

C

W. Sutton

D

T. Boveri

Question 77: Palette 77/175

NEET 2015 MCQ

In the following human pedigree, the filled symbols represent the affected individuals. Identify the type of given pedigree.

A

X-linked dominant

B

Autosomal dominant

C

Autosomal recessive

D

X-linked recessive

Question 78: Palette 78/175

NEET 2015 MCQ

A colour blind man marries a woman with normal sight who has no history of colour blindness in her family. What is the probability of their grandson being colour blind?

A

1

B

Nil

C

0.25

D

0.5

Question 79: Palette 79/175

NEET 2015 MCQ

A man with blood group ‘A’ marries a woman with blood group ‘B’. What are all the possible blood groups of their offsprings?

A

A and B only

B

A, B, AB and O

C

A, B and AB only

D

O only

Question 80: Palette 80/175

NEET 2015 MCQ

Multiple alleles are present

A

on different chromosomes

B

at the same locus of the chromosome

C

at different loci on the same chromosome.

D

on non-sister chromatids

Question 81: Palette 81/175

NEET 2015 MCQ

How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments?

A

Eight

B

Five

C

Seven

D

Six

Question 82: Palette 82/175

NEET 2015 MCQ

Alleles are

A

true breeding homozygotes

B

different phenotype

C

heterozygotes

D

different molecular forms of a gene

Question 83: Palette 83/175

NEET 2015 MCQ

An abnormal human baby with ‘XXX’ sex chromosomes was born due to

A

formation of abnormal sperms in the father

B

fusion of two ova and one sperm

C

formation of abnormal ova in the mother

D

fusion of two sperms and one ovum

Question 84: Palette 84/175

NEET 2015 MCQ

The movement of a gene from one linkage group to another is called

A

inversion

B

translocation

C

duplication

D

crossing over

Question 85: Palette 85/175

NEET 2014 MCQ

A human female with Turner’s syndrome :

A

is able to produce children with normal husband.

B

has 45 chromosomes with XO.

C

exhibits male characters.

D

has one additional X chromosome.

Question 86: Palette 86/175

NEET 2014 MCQ

Fruit colour in squash is an example of :

A

Recessive epistasis

B

Dominant epistasis

C

Complementary genes

D

Inhibitory genes

Question 87: Palette 87/175

NEET 2014 MCQ

A man whose father was colour blind marries a women who had a colour blind mother and normal father. What percentage of male children of this couple will be colour blind?

A

50%

B

25%

C

0%

D

75%

Question 88: Palette 88/175

NEET 2013 MCQ

Down's syndrome in humans is due to :

A

Three 'X' chromosomes

B

Monosomy

C

Three copies of chromosome 21

D

Two 'Y' chromosomes

Question 89: Palette 89/175

NEET 2013 MCQ

Which one is the incorrect statement with regards to the importance of pedigree analysis?

A

It confirms that DNA is the carrier of genetic information

B

It helps to trace the inheritance of a specific trait

C

It confirms that the trait is linked to one of the autosome

D

It helps to understand whether the trait in question is dominant or recessive

Question 90: Palette 90/175

NEET 2013 MCQ

Which idea is depicted by a cross in which the F₁ generation resembles both the parents?

A

law of dominance

B

co-dominance

C

incomplete dominance

D

inheritance of one gene

Question 91: Palette 91/175

NEET 2013 MCQ

If both parents are carriers for thalessemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child ?

A

100%

B

25%

C

no chance

D

50%

Question 92: Palette 92/175

NEET 2013 MCQ

Which of the following cannot be detected in a developing foetus by amniocentesis ?

A

Sex of the foetus

B

jaundice

C

Klinefelter syndrome

D

Down syndrome

Question 93: Palette 93/175

NEET 2013 MCQ

If two persons with 'AB' blood group marry and have sufficiently large number of children, these children could be classified as 'A' blood group : 'AB' blood group : 'B' blood group in 1 : 2 : 1 ratio. Modern technique of protein electrophoresis reveals presence of both 'A' and 'B' type proteins in 'AB' blood group individuals. This is an example of :

A

Codominance

B

Partial dominance

C

Incomplete dominance

D

Complete dominance

Question 94: Palette 94/175

NEET 2013 MCQ

Select the incorrect statement with regard to Haemophilia is :

A

It is a dominant disease

B

A single protein involved in the clotting of blood is affected

C

It is a recessive disease

D

It is a sex-linked disease

Question 95: Palette 95/175

NEET 2012 MCQ

Which one of the following is a wrong statement regarding mutations ?

A

UV and Gamma rays are mutagens

B

Deletion and insertion of base pairs cause frame-shift mutations

C

Cancer cells commonly show chromosomal aberrations

D

Change in a single base pair of DNA does not cause mutation

Question 96: Palette 96/175

NEET 2012 MCQ

A test cross is carried out to :

A

Determine whether two species or varieties will breed successfully

B

Determine the genotype of a plant at F₂

C

Predict whether two traits are linked

D

Assess the number of alleles of a gene

Question 97: Palette 97/175

NEET 2012 MCQ

Represented below is the inheritance pattern of the certain type of traits in humans. Which one of the following conditions could be an example of this pattern ?

A

Haemophilia

B

Sickel cell anaemia

C

Thalassemia

D

Phenylketonuria

Question 98: Palette 98/175

NEET 2012 MCQ

F₂ generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1 : 2 : 1. It represents a case of

A

Monohybrid cross with incomplete dominance

B

Co - dominance

C

Monohybrid cross with complete dominance

D

Dihybrid cross

Question 99: Palette 99/175

NEET 2012 MCQ

A normal - visioned man whose father was colour bilind, marries a woman whose father was also colour - blind. They have their first child as a daughter. What are the chances that this child would be colour blind

A

50%

B

25%

C

100%

D

Zero percent

Question 100: Palette 100/175

NEET 2011 MCQ

Test cross in plants or in Drosophila involves crossing :

A

the F₁ hybrid with a double recessive genotype

B

between two genotypes with dominant trait

C

between two F₁ hybrids

D

between two genotypes with recessive trait

Question 101: Palette 101/175

NEET 2011 MCQ

Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child ?

A

only one Y chromosome

B

only one X chromosome

C

one X and one Y chromosome

D

two X chromosomes

Question 102: Palette 102/175

NEET 2011 MCQ

Which one of the following conditions correctly describes the manner of determining the sex ?

A

XO condition in humans as found in Turner Syndrome, determines female sex

B

XO type of sex chromosomes determine male sex in grasshopper

C

Homozygous sex chromosomes (ZZ) determine female sex in Birds

D

Homozygous sex chromosomes (XX) produce male in Drosophila

Question 103: Palette 103/175

NEET 2011 MCQ

Mutations can be induced with :

A

Gamma radiation

B

Infra Red radiations

C

IAA

D

Ethylene

Question 104: Palette 104/175

NEET 2011 MCQ

When two unrelated individuals or lines are crossed, the per romance of F1 hybrid is often superior to both parents. This phenomenon is called :

A

Sphcing

B

Transformation

C

Heterosis

D

Metamorphosis

Question 105: Palette 105/175

NEET 2010 MCQ

Study the pedigree chart of a certain family given below and select the correct conculusion which can be drawn for the character –

A

The trait under study could not be colourblindness

B

The female parent is heterozygous

C

The parents could not have had a normal daughter for this character

D

The male parent is homozygous dominant

Question 106: Palette 106/175

NEET 2010 MCQ

ABO blood grouping is controlled by gene I which has three alleles and show co-dominance. There are six genotypes. How many phenotypes in all are possible -

A

five

B

four

C

three

D

six

Question 107: Palette 107/175

NEET 2010 MCQ

A cross in which an organism showing a dominant phenotype in crossed with the recessive parent in order to know its genotype is called -

A

Dihybrid cross

B

Back cross

C

Monohybrid cross

D

Test cross

Question 108: Palette 108/175

NEET 2010 MCQ

In antirrhinum two plants with pink flowers were hybridized. The F₁ plants produced red, pink and white flowers in the proportion of 1 red, 2 pink and 1 white. What could be the genotype of the two plants used for hybridization ? Red flower colour is determined by RR, and White by rr genes -

A

rrrr

B

rr

C

Rr

D

RR

Question 109: Palette 109/175

NEET 2010 MCQ

ABO blood groups in humans are controlled by the gene I. It has three alleles – I^A, I^B and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur –

A

One

B

Two

C

Three

D

Four

Question 110: Palette 110/175

NEET 2010 MCQ

Which one of the following cannot be explained on the basis of Mendel's Law of Dominance?

A

Out of one pair of factors one is dominant, and the other recessive

B

Alleles do not show any blending and both the characters recover as such in F₂ generation

C

The discrete unit controlling a particular character is called a factor

D

Factors occur in pairs

Question 111: Palette 111/175

NEET 2010 MCQ

The genotype of a plant showing the dominant phenotype can be determined by –

A

Pedigree analysis

B

Back cross

C

Test cross

D

Dihybrid cross

Question 112: Palette 112/175

NEET 2010 MCQ

Select the correct statement from the ones given below with respect to dihybrid cross –

A

Genes far apart on the same chromosome show very few recombinations

B

Tightly linked genes on the same chromosome show very few recombination

C

Tightly linked genes on the same chromosome show higher recombinations

D

Genes loosely linked on the same chromosome show similar recombinations as the tightly linked ones

Question 113: Palette 113/175

NEET 2010 MCQ

Which one of the following symbols and its representation, used in human pedigree analysis is correct –

A

B

C

D

Question 114: Palette 114/175

NEET 2009 MCQ

Select the incorrect statement from the following :

A

Baldness is a sex limited trait

B

Galactosemia is an inborn error of metabolism

C

Linkage is an exception to the principle of independent assortment in heredity.

D

Small population size results in random genetic drift in a population

Question 115: Palette 115/175

NEET 2009 MCQ

The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC, because "O" in it refers to having :

A

Other antigens besides A and B on RBCs

B

No antigens A and B on RBCs

C

Overdominance of this type on the genes for A and B types

D

One antibody only-either anti-A and anti-B on the RBCs

Question 116: Palette 116/175

NEET 2009 MCQ

Study the pedigree chart given below : What does it show ?

A

Inheritance of a recessive sex-linked disease like haemophilia

B

Inheritance of a sex-linked inborn error of metabolism like phenylketonuria

C

The pedigree chart is wrong as this is not possible

D

Inheritance of a condition like phenylketonuria as an autosomal recessive trait

Question 117: Palette 117/175

NEET 2009 MCQ

The genetic defect-adenosine deaminase (ADA) deficiency may be cured permanently by

A

Introducing bone marrow cells producing ADA into cells at early embryonic stages

B

Periodic infusion of genetically engineered lymphocytes having functional ADA cDNA

C

Administering adenosine deaminase activators

D

Enzyme replacement therapy

Question 118: Palette 118/175

NEET 2009 MCQ

Sickle-cell anemia is :

A

Caused by substitute of valine by glutamic acid in the beta globin chain of haemoglobin

B

An autosomal linked dominant trait

C

Caused by a change in a single base pair of DNA

D

Characterized by elongated sickle like RBCs with a nucleus

Question 119: Palette 119/175

NEET 2008 MCQ

Which one of the following conditions in humans is correctly matched with its chromosomal abnormality/linkage?

A

Klinfelter's syndrome — 44 autosomes + XXY

B

Colour-blindness — Y-linked

C

Down syndrome — 44 autosomes + XO

D

Erythroblastosis foetalis — X-linked

Question 120: Palette 120/175

NEET 2008 MCQ

Haploids are more suitable for mutation studies than the diploids. This is because:

A

all mutations, whether dominant or recessive are expressed in haploids

B

mutagens penetrate in haploids more effectively than in diploids

C

haploids are reproductively more stable than diploids

D

haploids are more abundant in nature than diploids

Question 121: Palette 121/175

NEET 2007 MCQ

A common test to find the genotype of a hybrid is by:-

A

Crossing of one F₁ progeny with male parent

B

Crossing of one F₂ progeny with female parent

C

Crossing of one F₂ progeny with male parent

D

Studying the sexual behaviour of F₁ progenies

Question 122: Palette 122/175

NEET 2007 MCQ

A human male produces sperms with the genotypes AB, Ab, AB, and ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person ?

A

AaBb

B

AABB

C

AaBB

D

AABb

Question 123: Palette 123/175

NEET 2007 MCQ

In the hexaploid wheat, the haploid(n) and basic(x) numbers of chromosomes are :

A

n = 21 and x = 14

B

n = 21 and x = 21

C

n = 7 and x = 21

D

n = 21 and x = 7

Question 124: Palette 124/175

NEET 2007 MCQ

Inheritance of skin colour in humans is an example of:-

A

Chromosomal aberration

B

Polygenic inheritance

C

Codominance

D

Point mutation

Question 125: Palette 125/175

NEET 2007 MCQ

In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in F₁ generation ?

A

9 : 1

B

3 : 1

C

50 : 50

D

1 : 3

Question 126: Palette 126/175

NEET 2006 MCQ

Sickle cell anaemia has not been eliminated from the African population because-

A

It is not a fatal disease

B

It is controlled by dominant genes

C

It is controlled by recessive genes

D

It provides immunity against malaria

Question 127: Palette 127/175

NEET 2006 MCQ

Test cross involves-

A

Crossing between two F₁ hybrids

B

Crossing the F₁ hybrid with a double recessive genotype

C

Crossing between two genotypes with recessive trait

D

Crossing between two genotypes with dominant trait

Question 128: Palette 128/175

NEET 2006 MCQ

In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F₂ generation of the cross RRYY × rryy ?

A

Round seeds with yellow cotyledons, and wrinkled seeds with yellow cotyledons

B

Only wrinkled seeds with green cotyledons

C

Only wrinkled seeds with yellow cotyledons

D

Only round seeds with green cotyledons

Question 129: Palette 129/175

NEET 2006 MCQ

How many different kinds of gametes will be produced by a plant having the genotype AABbCC ?

A

Two

B

Nine

C

Four

D

Three

Question 130: Palette 130/175

NEET 2006 MCQ

Phenotype of an organism is the result of-

A

Environmental changes and sexual dimorphism

B

Cytoplasmic effects and nutrition

C

Genotype and environment interactions

D

Mutations and linkages

Question 131: Palette 131/175

NEET 2006 MCQ

If a colour blind woman marries a normal visioned man, their sons will be

A

All normal visioned

B

Three-fourths colourblind and one-fourth normal

C

One-half colourblind and one-half normal

D

All colourblind

Question 132: Palette 132/175

NEET 2006 MCQ

Which one of the following is an example of polygenic inheritance ?

A

Skin colour in humans

B

Pod shape in garden pea

C

Production of male honey bee

D

Flower colour in Mirabilis jalapa

Question 133: Palette 133/175

NEET 2006 MCQ

Both sickle cell anemia and Huntington's chorea are-

A

Congenital disorders

B

Bacteria-related diseases

C

Virus-related diseases

D

Pollutant-induced disorders

Question 134: Palette 134/175

NEET 2006 MCQ

Cri-du-chat syndrome in humans is caused by the-

A

Loss of half of the long arm of chromosome 5

B

Loss of half of the short arm of chromosome 5

C

Trisomy of 21^st chromosome

D

Fertilization of an XX egg by a normal Y-bearing sperm

Question 135: Palette 135/175

NEET 2005 MCQ

G-6-P dehydrogenase deficiency is associated with haemolysis of -

A

RBCs

B

Lymphocytes

C

Platelets

D

Leucocytes

Question 136: Palette 136/175

NEET 2005 MCQ

Which of the following is not a hereditary disease ?

A

Cretinism

B

Cystic fibrosis

C

Haemophilia

D

Thalasasemia

Question 137: Palette 137/175

NEET 2005 MCQ

A man and a woman, who do not show any apparent signs of a certain inherited disease, have seven children (2 daughter and 5 sons). Three of the sons suffer from the given disease but none of the daughters are affected. Which of the following mode of inheritance do you suggest for this disease

A

Autosomal dominant

B

Sex-linked recessive

C

Sex-linked dominant

D

Sex-limited recessive

Question 138: Palette 138/175

NEET 2005 MCQ

A women with 47 chromosomes due to three copies of chromosome 21 is characterized by -

A

Superfemaleness

B

Turner's syndrome

C

Triploidy

D

Down's syndrome

Question 139: Palette 139/175

NEET 2005 MCQ

A women with 47 chromosomes due to three copies of chromosome 21 is characterized by

A

triploidy

B

Down’s syndrome

C

superfemaleness

D

Turner’s syndrome

Question 140: Palette 140/175

NEET 2005 MCQ

A woman with normal vision, but whose father was colour bind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. This boy -

A

May be colour blind or may be normal vision

B

Must have normal colour vision

C

Must be colour blind

D

Will be partially colour blind since he is heterozygous for the colour blind mutant allele.

Question 141: Palette 141/175

NEET 2005 MCQ

Haemophilia is more commonly seen in human males than in human females because -

A

This disease is due to an X-linked dominant mutation

B

This disease is due to a Y-linked recessive mutation

C

This disease is due to an X-linked recessive mutation

D

A greater proportion of girls die in infancy

Question 142: Palette 142/175

NEET 2005 MCQ

In order to find out the different types of gametes produced by a pea plants having the genotype AaBb, it should be crossed to a plant with the genotype -

A

aaBB

B

aabb

C

AaBb

D

AABB

Question 143: Palette 143/175

NEET 2004 MCQ

One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of F₂ progenies that mutation is found in -

A

50% of the progenies

B

1/3 of the progenies

C

None of the progenies

D

All the progenies

Question 144: Palette 144/175

NEET 2004 MCQ

The recessive genes located on X-chromosomes in humans are always-

A

Expressed in females

B

Sub-lethal

C

Expressed in males

D

Lethal

Question 145: Palette 145/175

NEET 2004 MCQ

A male human is heterozygous for autosomal genes A and B and is also hemizygous for hemophilic gene h. What proportion of his sperms will be abh :-

A

1/16

B

1/32

C

1/8

D

1/4

Question 146: Palette 146/175

NEET 2004 MCQ

A normal woman, whose father was colour-blind is married to a normal man. The sons would be :-

A

All colour-blind

B

75 % colour-blind

C

All normal

D

50% colour-blind

Question 147: Palette 147/175

NEET 2004 MCQ

Lack of independent assortment of two genes A and B in fruit fly Drosophila is due to :-

A

Linkage

B

Recombination

C

Repulsion

D

Crossing over

Question 148: Palette 148/175

NEET 2004 MCQ

In a plant, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTt genotype is crossed with a plant that is rrtt

A

75% will be tall with red fruit

B

25% will be tall with red fruit

C

50% will be tall with red fruit

D

All the offspring will be tall with red fruit

Question 149: Palette 149/175

NEET 2003 MCQ

Which one of the following conditions though harmful in itself, is also a potential saviour from a mosquito borne infectious disease ?

A

Pernicius anaemia

B

Thalassaemia

C

Leukemia

D

Sickle cell anaemia

Question 150: Palette 150/175

NEET 2003 MCQ

Down's syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder ?

A

50%

B

100%

C

75%

D

25%

Question 151: Palette 151/175

NEET 2003 MCQ

Pattern baldness, moustaches and beard in human males are examples of : -

A

Sex limited traits

B

Sex influenced traits

C

Sex determining traits

D

Sex linked traits

Question 152: Palette 152/175

NEET 2003 MCQ

In Drosophila, the sex is determined by : -

A

X and Y chromosomes

B

Whether the egg is fertilized or develops parthenogenetically

C

The ratio of number of X-chromosomes to the sets of autosomes

D

The ratio of pairs of X-chromosomes to the pairs of autosomes

Question 153: Palette 153/175

NEET 2003 MCQ

Two crosses between the same pair of genotypes or phenotypes in which the sources of the gametes are reversed in one cross, is known as : -

A

Reciprocal cross

B

Reverse cross

C

Test cross

D

Dihybrid cross

Question 154: Palette 154/175

NEET 2003 MCQ

Which one of the following traits of garden pea studied by Mendel was a recessive feature ?

A

Green seed colour

B

Green pod colour

C

Axial flower position

D

Round seed shape

Question 155: Palette 155/175

NEET 2003 MCQ

The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes ?

A

Six

B

Seven

C

Five

D

Four

Question 156: Palette 156/175

NEET 2002 MCQ

There are three genes a, b and c. The percentage of crossing over between a and b is 20%, b and c is 28% and a and c is 8%. What is the sequence of genes on chromosome

A

a, b, c

B

b, a, c

C

a, c, b

D

None

Question 157: Palette 157/175

NEET 2002 MCQ

Which of the following is a correct match -

A

Sickel cell anaemia = X – Chromosome

B

Down Syndrome = 21^st Chromosome

C

Haemophilia = Y – Chromosome

D

Parkinson Disease = X & Y Chromosome

Question 158: Palette 158/175

NEET 2002 MCQ

A diseased man marries a normal woman. They get three daughter and five sons. All the daughter were diseased and sons were normal. The gene of this disease is : -

A

Sex linked dominant

B

Autosomal dominant

C

Sex linked recessive

D

Sex limited character

Question 159: Palette 159/175

NEET 2002 MCQ

Which of the following is the example of pleiotropy ?

A

Thalassemea

B

Haemophilia

C

Sickle cell anaemia

D

Colour blindness

Question 160: Palette 160/175

NEET 2002 MCQ

A gene said to be dominant if : -

A

It expressed only in heterozygous condition

B

It express it's effect only in homozygous stage

C

It never expressed in any condition

D

It expressed both in homozygous and heterozygous condition

Question 161: Palette 161/175

NEET 2002 MCQ

On selfing a plant of F₁ generation with genotype “AABbCC”,the genotypic ratio in F₂ generation will be

A

1 : 1

B

3 : 1

C

9 : 3 : 3 : 1

D

27 : 9 : 9 : 9 : 3 : 3 : 3 : 1

Question 162: Palette 162/175

NEET 2001 MCQ

Independent assortment of genes does not takes place when : -

A

Genes are located on non-homologous chromosome

B

Genes are linked and located on same chromosome

C

Genes are located on homologous chromosomes

D

All the above

Question 163: Palette 163/175

NEET 2001 MCQ

A and B genes are linked. What shall be genotype of progeny in a cross between AB/ab and ab/ab : -

A

AABB and aabb

B

None

C

AaBb and aabb

D

AAbb and aabb

Question 164: Palette 164/175

NEET 2001 MCQ

Sickle cell anaemia is induce to : -

A

Change of Amino acid either a or b chain of Haemoglobin

B

Change of Amino Acid in a chain of Haemoglobin

C

Change of Amino acid in both a and b chain of Haemoglobin

D

Change of Amino Acid in b chain of Haemoglobin

Question 165: Palette 165/175

NEET 2001 MCQ

When dominant and recessive allels express itself together it is called : -

A

Dominance

B

Pseudo dominance

C

Co-dominance

D

Amphidominance

Question 166: Palette 166/175

NEET 2001 MCQ

Number of Barr bodies in XXXX female is

A

3

B

1

C

2

D

4

Question 167: Palette 167/175

NEET 2001 MCQ

Probability of four son to a couple is : -

A

$1 \over 16$

B

$1 \over 8$

C

$1 \over 4$

D

$1 \over 32$

Question 168: Palette 168/175

NEET 2001 MCQ

Two nonallelic genes produces the new phenotype when present together but fail to do so independently then it is called : -

A

Polygene

B

Complimentry gen

C

Non complimentry gene

D

Epistasis

Question 169: Palette 169/175

NEET 2001 MCQ

Ratio of complementry genes is : -

A

9 : 3 : 4

B

9 : 7

C

12 : 3 : 1

D

9 : 3 : 3 : 4

Question 170: Palette 170/175

NEET 2001 MCQ

Male XX and female XY sometime occur due to

A

Aneuploidy

B

Deletion

C

Transfer of segments in X and Y chromosomes

D

Hormonal imbalance

Question 171: Palette 171/175

NEET 2000 MCQ

Mongolian idiots are due to trisomy in 21^st chromosome is called :

A

Kleinfelters syndrome

B

Down's syndrome

C

Turner's syndrome

D

Triplex syndrome

Question 172: Palette 172/175

NEET 2000 MCQ

Due to the cross between TTRr × ttrr the resultant progenies showed how many percent plants tall, red flowered :

A

50%

B

100%

C

75%

D

25%

Question 173: Palette 173/175

NEET 2000 MCQ

According to mendelism which character is showing dominance ?

A

Green colour in seed coat

B

Wrinkled seed

C

Terminal position of flower

D

Green pod colour

Question 174: Palette 174/175

NEET 2000 MCQ

Erythroblastosis foetalis is caused when :

A

Rh^– female & Rh⁺ male

B

Rh^– female & Rh^– male

C

Rh⁺ female & Rh⁺ male

D

Rh⁺ female & Rh^– male

Question 175: Palette 175/175

NEET 2000 MCQ

In Drosophila the XXY condition leads to femaleness whereas in human beings the same condition leads to Klienfelter's syndrome in male. It proves :

A

Y chromosome is active in sex determination in both human beings and Drosophila

B

In Drosophila Y-chromosome decides femaleness

C

Y chromosome of man have genes for syndrome

D

In human beings Y chromosome is active in sex determination