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Principles of Inheritance and Variation

184 Questions Start NEET Test
All Exams NEET AIIMS
2005 Q151 NEET MCQ
10 Mar 2026
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
2004 Q152 NEET MCQ
10 Mar 2026
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
2004 Q153 NEET MCQ
10 Mar 2026
The recessive genes located on X-chromosomes in humans are always-
A.
Expressed in females
B.
Sub-lethal
C.
Expressed in males
D.
Lethal
2004 Q154 NEET MCQ
10 Mar 2026
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
2004 Q155 NEET MCQ
10 Mar 2026
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
2004 Q156 NEET MCQ
10 Mar 2026
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
2004 Q157 NEET MCQ
10 Mar 2026
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
2003 Q158 NEET MCQ
10 Mar 2026
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
2003 Q159 NEET MCQ
10 Mar 2026
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%
2003 Q160 NEET MCQ
10 Mar 2026
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
2003 Q161 NEET MCQ
10 Mar 2026
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
2003 Q162 NEET MCQ
10 Mar 2026
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
2003 Q163 NEET MCQ
10 Mar 2026
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
2003 Q164 NEET MCQ
10 Mar 2026
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
2002 Q165 NEET MCQ
10 Mar 2026
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
2002 Q166 NEET MCQ
10 Mar 2026
Which of the following is a correct match -
A.
Sickel cell anaemia = X – Chromosome
B.
Down Syndrome = 21st Chromosome
C.
Haemophilia = Y – Chromosome
D.
Parkinson Disease = X & Y Chromosome
2002 Q167 NEET MCQ
10 Mar 2026
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
2002 Q168 NEET MCQ
10 Mar 2026
Which of the following is the example of pleiotropy ?
A.
Thalassemea
B.
Haemophilia
C.
Sickle cell anaemia
D.
Colour blindness
2002 Q169 NEET MCQ
10 Mar 2026
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
2002 Q170 NEET MCQ
10 Mar 2026
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
2001 Q171 NEET MCQ
10 Mar 2026
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
2001 Q172 NEET MCQ
10 Mar 2026
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
2001 Q173 NEET MCQ
10 Mar 2026
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
2001 Q174 NEET MCQ
10 Mar 2026
When dominant and recessive allels express itself together it is called : -
A.
Dominance
B.
Pseudo dominance
C.
Co-dominance
D.
Amphidominance
2001 Q175 NEET MCQ
10 Mar 2026
Number of Barr bodies in XXXX female is
A.
3
B.
1
C.
2
D.
4
2001 Q176 NEET MCQ
10 Mar 2026
Probability of four son to a couple is : -
A.
$1 \over 16$
B.
$1 \over 8$
C.
$1 \over 4$
D.
$1 \over 32$
2001 Q177 NEET MCQ
10 Mar 2026
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
2001 Q178 NEET MCQ
10 Mar 2026
Ratio of complementry genes is : -
A.
9 : 3 : 4
B.
9 : 7
C.
12 : 3 : 1
D.
9 : 3 : 3 : 4
2001 Q179 NEET MCQ
10 Mar 2026
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
2000 Q180 NEET MCQ
10 Mar 2026
Mongolian idiots are due to trisomy in 21st chromosome is called :
A.
Kleinfelters syndrome
B.
Down's syndrome
C.
Turner's syndrome
D.
Triplex syndrome
2000 Q181 NEET MCQ
10 Mar 2026
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%
2000 Q182 NEET MCQ
10 Mar 2026
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
2000 Q183 NEET MCQ
10 Mar 2026
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
2000 Q184 NEET MCQ
10 Mar 2026
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