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NEET

Principles of Inheritance and Variation

Biology

Previous Years Questions

MCQ (Single Correct Answer)

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In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny wil...
NEET 2021
Now-a-days it is possible to detect the mutated gene causing cancer by allowing radioactive probe to hybridise its compl...
NEET 2021
The production of gametes by the parents, formation of zygotes, the F1 and F2 plants, can be understood from a diagram c...
NEET 2021
How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with c...
NEET 2020 Phase 1
Select the correct match
NEET 2020 Phase 1
Embryological support for evolution was disapproved by
NEET 2020 Phase 1
Experimental verification of the chromosomal theory of inheritance was done by
NEET 2020 Phase 1
Select the incorrect statement.
NEET 2019
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 homo...
NEET 2019
What map unit (Centimorgan) is adopted in the construction of genetic maps?
NEET 2019
What is the genetic disorder in which an individual has an overall masculine development, gynaecomastia, and is sterile?
NEET 2019
The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was ...
NEET 2019
In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F1 generation, pink flowers were obtain...
NEET 2019
A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by
NEET 2018
Which of the following pairs is wrongly matched?
NEET 2018
Which of the following characteristics represent 'Inheritance of blood groups' in humans? a. Dominance b. Co-dominance...
NEET 2018
Among the following characters, which one was not considered by Mendel in his experiments on pea?
NEET 2017
Which one from those given below is the period for Mendel’s hybridisation experiments ?
NEET 2017
A disease caused by an autosomal primary non-disjunction is :
NEET 2017
The genotypes of a Husband and Wife are IAIB and IAi. Among the blood types of their children, how many different genoty...
NEET 2017
Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statemen...
NEET 2017
A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were se...
NEET 2016 Phase 1
Pick out the correct statements : (a) Haemophilia is a sex-linked recessive disease. (b) Down's syndrome is due to aneup...
NEET 2016 Phase 1
A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cel...
NEET 2016 Phase 1
Match the terms in Column-I with their description in Column-II and choose the correct option : .tg {border-collapse:c...
NEET 2016 Phase 1
Which of the following most appropriately describes haemophilia ?
NEET 2016 Phase 1
In a testcross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-typeoffsprin...
NEET 2016 Phase 1
If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being col...
NEET 2016 Phase 2
The mechanism that causes a gene to move from one linkage group to another is called
NEET 2016 Phase 2
An abnormal human baby with ‘XXX’ sex chromosomes was born due to
AIPMT 2015 Cancelled Paper
Multiple alleles are present
AIPMT 2015 Cancelled Paper
How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments?
AIPMT 2015 Cancelled Paper
A man with blood group ‘A’ marries a woman with blood group ‘B’. What are all the possible blood groups of their offspri...
AIPMT 2015 Cancelled Paper
Alleles are
AIPMT 2015 Cancelled Paper
The movement of a gene from one linkage group to another is called
AIPMT 2015 Cancelled Paper
In the following human pedigree, the filled symbols represent the affected individuals. Identify the type of given pedig...
NEET 2015
The term "linkage" was coined by -
NEET 2015
In his classic experiments on pea plants, Mendel did not use :
NEET 2015
A pleiotropic gene -
NEET 2015
A colour blind man marries a woman with normal sight who has no history of colour blindness in her family. What is the p...
NEET 2015
A gene showing codominance has :
NEET 2015
A human female with Turner’s syndrome :
NEET 2014
Fruit colour in squash is an example of :
NEET 2014
A man whose father was colour blind marries a women who had a colour blind mother and normal father. What percentage of ...
NEET 2014
Which one is the incorrect statement with regards to the importance of pedigree analysis?
NEET 2013 (Karnataka)
Down's syndrome in humans is due to :
NEET 2013 (Karnataka)
If both parents are carriers for thalessemia, which is an autosomal recessive disorder, what are the chances of pregnanc...
NEET 2013
Which of the following cannot be detected in a developing foetus by amniocentesis ?
NEET 2013
If two persons with 'AB' blood group marry and have sufficiently large number of children, these children could be class...
NEET 2013
Which idea is depicted by a cross in which the F1 generation resembles both the parents?
NEET 2013
Select the incorrect statement with regard to Haemophilia is :
NEET 2013
Which one of the following is a wrong statement regarding mutations ?
AIPMT 2012 Mains
A test cross is carried out to :
AIPMT 2012 Mains
F2 generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1 : 2 : 1. It represents...
AIPMT 2012 Prelims
Represented below is the inheritance pattern of the certain type of traits in humans. Which one of the following conditi...
AIPMT 2012 Mains
A normal - visioned man whose father was colour bilind, marries a woman whose father was also colour - blind. They have ...
AIPMT 2012 Prelims
Mutations can be induced with :
AIPMT 2011 Prelims
Test cross in plants or in Drosophila involves crossing :
AIPMT 2011 Mains
Which one of the following conditions correctly describes the manner of determining the sex ?
AIPMT 2011 Prelims
Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child ?
AIPMT 2011 Mains
When two unrelated individuals or lines are crossed, the per romance of F1 hybrid is often superior to both parents. Thi...
AIPMT 2011 Prelims
In antirrhinum two plants with pink flowers were hybridized. The F1 plants produced red, pink and white flowers in the p...
AIPMT 2010 Mains
A cross in which an organism showing a dominant phenotype in crossed with the recessive parent in order to know its geno...
AIPMT 2010 Mains
Study the pedigree chart of a certain family given below and select the correct conculusion which can be drawn for the c...
AIPMT 2010 Mains
ABO blood grouping is controlled by gene I which has three alleles and show co-dominance. There are six genotypes. How m...
AIPMT 2010 Mains
Which one of the following cannot be explained on the basis of Mendel's Law of Dominance?
AIPMT 2010 Prelims
The genotype of a plant showing the dominant phenotype can be determined by –
AIPMT 2010 Prelims
Select the correct statement from the ones given below with respect to dihybrid cross –
AIPMT 2010 Prelims
ABO blood groups in humans are controlled by the gene I. It has three alleles – IA, IB and i. Since there are three dif...
AIPMT 2010 Prelims
Which one of the following symbols and its representation, used in human pedigree analysis is correct –
AIPMT 2010 Prelims
Study the pedigree chart given below : What does it show ? ...
AIPMT 2009
The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC, because "O" in it refers to ha...
AIPMT 2009
The genetic defect-adenosine deaminase (ADA) deficiency may be cured permanently by
AIPMT 2009
Sickle-cell anemia is :
AIPMT 2009
Select the incorrect statement from the following :
AIPMT 2009
Which one of the following conditions in humans is correctly matched with its chromosomal abnormality/linkage?
AIPMT 2008
In the hexaploid wheat, the haploid(n) and basic(x) numbers of chromosomes are:
AIPMT 2007
A common test to find the genotype of a hybrid is by:-
AIPMT 2007
Inheritance of skin colour in humans is an example of:-
AIPMT 2007
In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded ...
AIPMT 2007
A human male produces sperms with the genotypes AB, Ab, AB, and ab pertaining to two diallelic characters in equal propo...
AIPMT 2007
Phenotype of an organism is the result of-
AIPMT 2006
Which one of the following is an example of polygenic inheritance ?
AIPMT 2006
How many different kinds of gametes will be produced by a plant having the genotype AABbCC ?
AIPMT 2006
Sickle cell anaemia has not been eliminated from the African population because-
AIPMT 2006
In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (...
AIPMT 2006
Cri-du-chat syndrome in humans is caused by the-
AIPMT 2006
If a colour blind woman marries a normal visioned man, their sons will be
AIPMT 2006
Both sickle cell anemia and Huntington's chorea are-
AIPMT 2006
Test cross involves-
AIPMT 2006
A women with 47 chromosomes due to three copies of chromosome 21 is characterized by
AIPMT 2005
Which of the following is not a hereditary disease ?
AIPMT 2005
A woman with normal vision, but whose father was colour bind, marries a colour blind man. Suppose that the fourth child ...
AIPMT 2005
Haemophilia is more commonly seen in human males than in human females because -
AIPMT 2005
A women with 47 chromosomes due to three copies of chromosome 21 is characterized by -
AIPMT 2005
A man and a woman, who do not show any apparent signs of a certain inherited disease, have seven children (2 daughter an...
AIPMT 2005
G-6-P dehydrogenase deficiency is associated with haemolysis of -
AIPMT 2005
In order to find out the different types of gametes produced by a pea plants having the genotype AaBb, it should be cros...
AIPMT 2005
The recessive genes located on X-chromosomes in humans are always-
AIPMT 2004
A normal woman, whose father was colour-blind is married to a normal man. The sons would be :-
AIPMT 2004
One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as a male. During ...
AIPMT 2004
Lack of independent assortment of two genes A and B in fruit fly Drosophila is due to :-
AIPMT 2004
A male human is heterozygous for autosomal genes A and B and is also hemizygous for hemophilic gene h. What proportion o...
AIPMT 2004
In a plant, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant ...
AIPMT 2004
Which one of the following conditions though harmful in itself, is also a potential saviour from a mosquito borne infect...
AIPMT 2003
Down's syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected...
AIPMT 2003
In Drosophila, the sex is determined by : -
AIPMT 2003
Pattern baldness, moustaches and beard in human males are examples of : -
AIPMT 2003
Two crosses between the same pair of genotypes or phenotypes in which the sources of the gametes are reversed in one cro...
AIPMT 2003
The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chrom...
AIPMT 2003
Which one of the following traits of garden pea studied by Mendel was a recessive feature ?
AIPMT 2003
Which of the following is a correct match -
AIPMT 2002
A diseased man marries a normal woman. They get three daughter and five sons. All the daughter were diseased and sons we...
AIPMT 2002
A gene said to be dominant if : -
AIPMT 2002
On selfing a plant of F1 generation with genotype “AABbCC”,the genotypic ratio in F2 generation will be...
AIPMT 2002
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 ...
AIPMT 2002
Which of the following is the example of pleiotropy ?
AIPMT 2002
Probability of four son to a couple is : -
AIPMT 2001
Male XX and female XY sometime occur due to
AIPMT 2001
Sickle cell anaemia is induce to : -
AIPMT 2001
Number of Barr bodies in XXXX female is
AIPMT 2001
Independent assortment of genes does not takes place when : -
AIPMT 2001
A and B genes are linked. What shall be genotype of progeny in a cross between AB/ab and ab/ab : -
AIPMT 2001
When dominant and recessive allels express itself together it is called : -
AIPMT 2001
Ratio of complementry genes is : -
AIPMT 2001
Two nonallelic genes produces the new phenotype when present together but fail to do so independently then it is called ...
AIPMT 2001
In Drosophila the XXY condition leads to femaleness whereas in human beings the same condition leads to Klienfelter's sy...
AIPMT 2000
Erythroblastosis foetalis is caused when :
AIPMT 2000
Mongolian idiots are due to trisomy in 21st chromosome is called :
AIPMT 2000
Due to the cross between TTRr × ttrr the resultant progenies showed how many percent plants tall, red flowered :
AIPMT 2000
According to mendelism which character is showing dominance ?
AIPMT 2000

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