Quantrex Academy Quantrex AcademyPYQs with solutions · JEE · NEET · NDA

Home · NEET UG · Zoology · Principles of Inheritance and Variation

Principles of Inheritance and Variation — NEET UG Zoology PYQs

872 previous year questions from Principles of Inheritance and Variation with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

872 questionsZoologySolutions on every page
1

Match List I with List II : List I List II A. Incomplete dominance I. Human skin colour B. Co-dominance II. Inheritance of flower colour in Antirrhinum sp. C. Pleiotropy III. Pheny

NEET 2026 Solution View → 2

The sixth mutant codon of beta globin gene causing polymerization of Haemoglobin and change in RBC shape is :

NEET 2026 Solution View → 3

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 thi

NEET 2026 Solution View → 4

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

NEET 2026 Solution View → 5

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

NEET 2026 Solution View → 6

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 a

NEET 2026 Solution View → 7

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 a

NEET 2026 Solution View → 8

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

NEET 2026 Solution View → 9

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

NEET 2026 Solution View → 10

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 F₃

NEET 2025 Solution View → 11

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?

NEET 2025 Solution View → 12

What is the pattern of inheritance for polygenic trait?

NEET 2025 Solution View → 13

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 t

NEET 2024 Solution View → 14

Match List-I with List-II: array llll List-I & List-II of Inheritance & Example .Incomplete dominance & I. Blood groups in human .Co-dominance & II. Flower colour in Antirrhinum .P

NEET 2024 Solution View → 15

Given below are two statements: Statement I: Failure of segregation of chromatids during cell cycle resulting in the gain or loss of whole set of chromosome in an organism is known

NEET 2024 Solution View → 16

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

NEET 2024 Solution View → 17

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. Translocat

NEET 2024 Solution View → 18

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 s

NEET 2024 Solution View → 19

Match List I with List II Choose the correct answer from the options given below:

NEET 2024 Solution View → 20

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

NEET 2024 Solution View → 21

In a plant, black seed color (BB/Bb) is dominant over white seed color (bb). In order to find out the genotype of the black seed plant, with which of the following genotype will yo

NEET 2024 Solution View → 22

Match List I with List II : array |l|l|l|l| & List I & & List II A. & Down's syndrome & I. & 11^ th chromosome B. & -Thalassemia & II. & 'X' chromosome C. & -Thalassemia & III. & 2

NEET 2024 Solution View → 23

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

NEET 2023 Solution View → 24

Match List-I with List-II. Choose the correct answer from the options given below :

NEET 2023 Solution View → 25

A heterozygous pea plant with violet flowers was crossed with a homozygous pea plant with white flowers. Violet is dominant over white. Which one of the following represents the ex

NEET 2023 Solution View → 26

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.

NEET 2023 Solution View → 27

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

NEET 2023 Solution View → 28

The phenomenon of pleiotropism refers to:

NEET 2023 Solution View → 29

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

NEET 2023 Solution View → 30

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

NEET 2023 Solution View → 31

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

NEET 2023 Solution View → 32

Select the correct statements about sickle cell anaemia. (A) There is a change in gene for beta globin. (B) In the beta globin, there is valine in the place of Lysine. (C) It is an

NEET 2023 Solution View → 33

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 mascu

NEET 2023 Solution View → 34

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

NEET 2022 Solution View → 35

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 dev

NEET 2022 Solution View → 36

The chromosomal theory of inheritance was proposed by :

NEET 2022 Solution View → 37

What is the expected percentage of F ₂ progeny with yellow and inflated pod in dihybrid cross experiment involving pea plants with green coloured, inflated pod and yellow coloured

NEET 2022 Solution View → 38

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

NEET 2022 Solution View → 39

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 exa

NEET 2022 Solution View → 40

XO type of sex determination can be found in:

NEET 2022 Solution View → 41

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 assortments does not hold g

NEET 2022 Solution View → 42

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

NEET 2022 Solution View → 43

The recombination frequency between the genes a and c is 5 % , b and c is 15 % , b and d is 9 % , a and b is 20 % , c and d is 24 % and a and d is 29 % . What will be the sequence

NEET 2022 Solution View → 44

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

NEET 2022 Solution View → 45

A normal girl, whose mother is haemophilic marries a male with no ancestral history of haemophilia. What will be the possible phenotypes of the offsprings ? (a) Haemophilic son and

NEET 2022 Solution View → 46

The production of gametes by the parents, formation of zygotes, the F 1 and F 2 plants, can be understood from a diagram called:

NEET 2021 Solution View → 47

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

NEET 2021 Solution View → 48

The number of contrasting characters studied by Mendel for his experiments was:

NEET 2020 Solution View → 49

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

NEET 2020 Solution View → 50

Select the correct match.

NEET 2020 Solution View → 51

Identify the wrong statement with reference to the gene ‘I’ that controls ABO blood groups.

NEET 2020 Solution View → 52

Chromosomal theory of inheritance was proposed by:

NEET 2020 Solution View → 53

The best example for pleiotropy is:

NEET 2020 Solution View → 54

Experimental verification of the chromosomal theory of inheritance was done by

NEET 2020 Solution View → 55

Karyotype of Down's syndrome has how many chromosomes?

JIPMER 2019 Solution View → 56

Gynaecomastia is present in which syndrome?

JIPMER 2019 Solution View → 57

A normal man and a normal woman both having one of their parent albino, if get married then what is the probability of their child of being albino?

JIPMER 2019 Solution View → 58

Which one of them is odd with respect to human male?

JIPMER 2019 Solution View → 59

Match the items of Column I with Column II. Select the correct option from the following

NEET 2019 Solution View → 60

In which genetic condition, each cell in the affected person, has three sex chromosomes XXY?

NEET 2019 Solution View → 61

In a marriage between male with blood group A and female with blood group B, the progeny had either blood group AB or B . What could be the possible genotype of parents?

NEET 2019 Solution View → 62

The production of gametes by the parents, the formation of zygotes, the F ₁ and F ₂ plants, can be understood using

NEET 2019 Solution View → 63

The genetic disorder in which an individual has an overall masculine development, gynaecomastia and is sterile:

NEET 2019 Solution View → 64

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

NEET 2019 Solution View → 65

Select the incorrect statement.

NEET 2019 Solution View → 66

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

NEET 2019 Solution View → 67

Which of the following muscular disorders is inherited?

NEET 2019 Solution View → 68

In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F 1 generation, pink flowers were obtained. When pink flowers were selfed, the F 2 generation showe

NEET 2019 Solution View → 69

AB blood group shows

JIPMER 2018 Solution View → 70

Non-disjunction in meiosis results in

JIPMER 2018 Solution View → 71

Which trait is shown by given pedigree analysis?

JIPMER 2018 Solution View → 72

Which of the following pairs is wrongly matched?

NEET 2018 Solution View → 73

Select the correct statement.

NEET 2018 Solution View → 74

A woman has X-linked condition on one of her X chromosomes. These chromosomes can be inherited by:

NEET 2018 Solution View → 75

Which of the following characteristics represent 'Inheritance of blood groups' in humans? i. Dominance ii. Co-dominance iii. Multiple alleles iv. Incomplete dominance v. Polygenic

NEET 2018 Solution View → 76

If two persons with 'AB' blood group marry and have suffeciently large number of children, these children could be classified as 'A' blood group. 'AB blood group 'B' blood group in

JIPMER 2017 Solution View → 77

A disease caused by an autosomal primary non-disjunction is

NEET 2017 Solution View → 78

Which one from those given below is the period for Mendel's hybridization experiments?

NEET 2017 Solution View → 79

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

NEET 2017 Solution View → 80

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

NEET 2017 Solution View → 81

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

NEET 2017 Solution View → 82

The phenotypic ratio of trihybrid cross in F ₂ - generation is

JIPMER 2016 Solution View → 83

Which one of the following pair is not correct?

JIPMER 2016 Solution View → 84

Snapdragon flower is an exception of Mendel's laws. It is a good example of

JIPMER 2016 Solution View → 85

Number of Barr body which will found in case of Turner's syndrome will be

JIPMER 2016 Solution View → 86

A true breeding plant is:

NEET 2016 Solution View → 87

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

NEET 2016 Solution View → 88

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

NEET 2016 Solution View → 89

Which of the following most appropriately describes haemophilia?

NEET 2016 Solution View → 90

Pick out the correct statements: (i) Haemophilia is a sex-linked recessive disease. (ii) Down's syndrome is due to aneuploidy. (iii) Phenylketonuria is an autosomal recessive gene

NEET 2016 Solution View → 91

In a testcross involving F 1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates:

NEET 2016 Solution View → 92

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) Cod

NEET 2016 Solution View → 93

A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F 1 plants were selfed the resulting genotypes were in the ratio

NEET 2016 Solution View → 94

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 could yo

JIPMER 2015 Solution View → 95

Match the following Column I with Column II. array ll|ll & Column I & & Column II A. & Complementary ratio & 1. & 9: 7 B. & Supplementary ratio & 2. & 9: 3: 4 C. & Epistatic ratio

JIPMER 2015 Solution View → 96

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

NEET 2015 Solution View → 97

A pleiotropic gene

NEET 2015 Solution View → 98

A gene showing codominance has

NEET 2015 Solution View → 99

The term ''linkage'' was coined by:

NEET 2015 Solution View → 100

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

NEET 2015 Solution View → 101

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

NEET 2015 Solution View → 102

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

NEET 2015 Solution View → 103

Multiple alleles are present:

NEET 2015 Solution View → 104

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

NEET 2015 Solution View → 105

An abnormal human baby with 'XXX' sex chromosomes was born due to:

NEET 2015 Solution View → 106

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

NEET 2015 Solution View → 107

Select the correct statement from the one's given below with respect to dihybrid cross.

JIPMER 2014 Solution View → 108

The dominant epistasis ratio is

JIPMER 2014 Solution View → 109

Two genes R and y are located very close on the chromosome linkage map on maize plant. When RRYY and rryy genotypes are hybridised, then F ₂ segregation will show

JIPMER 2014 Solution View → 110

Fruit color in squash is an example of:

NEET 2014 Solution View → 111

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

NEET 2014 Solution View → 112

A human female with Turner's syndrome

NEET 2014 Solution View → 113

The year 1900 AD is highly significant for geneticists due to

JIPMER 2013 Solution View → 114

Mendelism F ₁ -generation means

JIPMER 2013 Solution View → 115

Skin colour is controlled by

JIPMER 2013 Solution View → 116

Which of the following cross will produce terminal flower in garden pea?

JIPMER 2013 Solution View → 117

In our society women are blamed for producing female children. Choose the correct answer for the sex-determination in humans.

NEET 2013 Solution View → 118

Down's syndrome in humans is due to:

NEET 2013 Solution View → 119

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

NEET 2013 Solution View → 120

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 grou

NEET 2013 Solution View →
Practice all Principles of Inheritance and Variation questions in the app →