Principles of Inheritance & Variation PYQs Set 1 (PDF)

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Mere Teacher · Previous Year Questions NEET Biology · Principles of Inheritance & Variation · Set 1 (Q1-30)
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1. $A certain road accident patient with unknown blood group needs immediate blood transfusion. His one doctor friend at once offers his blood. What was the blood group of the donor?$ (1) $Blood group O$ (2) $Blood group A$ (3) $Blood group B$ (4) $Blood group AB$ 2. $In his classic experiments on pea plants, Mendel did not use :$ (1) $Flower position$ (2) $Seed colour$ (3) $Pod length$ (4) $Seed shape$ 3. $Assuming that fur colour of an animal is dark, range of colour shade and white. A cross is made between a male (AABBCC) with dark fur colour and a female (aabbcc) with white fur colour. What would be the fur colour of F_{1} generation?$ (1) $Range of colour shade$ (2) $All dark colour$ (3) $All white colour$ (4) $All intermediate colour$ 4. $The amino acid Tryptophan is the precursor for the synthesis of:$ (1) $Melatonin and Serotonin$ (2) $Thyroxine and Triiodothyronine$ (3) $Estrogen and Progesterone$ (4) $Cortisol and Cortisone$ 5. $Which Mendelian idea is depicted by a cross in which the F_{1} generation resembles both the parents?$ (1) $Incomplete dominance$ (2) $Law of dominance$ (3) $Inheritance of one gene$ (4) $Codominance$ 6. $In a population of 1000 individuals 360 belong to genotype AA, 480 to Aa and the remaining 160 to aa. Based on this data, the frequency of allele A in the population is :-$ (1) $0.4$ (2) $0.5$ (3) $0.6$ (4) $0.7$ 7. $Which of the following most appropriately describes haemophilia?$ (1) $Recessive gene disorder$ (2) $X - linked recessive gene disorder$ (3) $Chromosomal disorder$ (4) $Dominant gene disorder$ 8. $ABO blood groups in humans are controlled by the gene I. It has three alleles - l^{A}, I^{B} and i. Since there are here different alleles, six different genotypes are possible. How many phenotypes can occur?$ (1) $Three$ (2) $One$ (3) $Four$ (4) $Two$ 9. $Fruit colour in squash is an example of :-$ (1) $Recessive epistasis$ (2) $Dominant epistasis$ (3) $Complementary genes$ (4) $Inhibitory genes$ 10. $Whether a tall plant from F_{1} or F_{2} has TT or Tt composition, it can be predicted by$ (1) $Monohybrid cross$ (2) $Out cross$ (3) $Dihybrid cross$ (4) $Test cross$ 11. $When two unrelated individuals or lines are crossed, the performance of F_{1} hybrid is often superior to both its parents. This phenomenon is called :-$ (1) $Heterosis$ (2) $Transformation$ (3) $Splicing$ (4) $Metamorphosis$ 12. $Frequency of recombination between gene pairs on same chromosome as a measure of the distance between genes to map their position on chromosome, was used for the first time by$ (1) $Henking$ (2) $Thomas Hunt Morgan$ (3) $Sutton and Boveri$ (4) $Alfred Sturtevant$ 13. $What map unit (Centimorgan) is adopted in the construction of genetic maps?$ (1) $A unit of distance between two expressed genes, representing 10% cross over$ (2) $A unit of distance between two expressed genes, representing 100% cross over$ (3) $A unit of distance between genes on chromosomes, representing 1% cross over$ (4) $A unit of distance between genes on chromosomes, representing 50% cross over$ 14. $In Hardy-Weinberg equation, the frequency of heterozygous individual is represented by :-$ (1) $pq$ (2) $q^{2}$ (3) $p^{2}$ (4) $2pq$ 15. $If both parents are carriers for thalassemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?$ (1) $100%$ (2) $No chance$ (3) $50%$ (4) $25%$ 16. $The chromosomal theory of inheritance was proposed by :$ (1) $Thomas Morgan$ (2) $Sutton and Boveri$ (3) $Gregor Mendel$ (4) $Robert Brown$ 17. $A man whose father was colour blind marries a woman who had a colour blind mother and normal father. What percentage of male children of this couple will be colour blind ?$ (1) $25%$ (2) $0%$ (3) $50%$ (4) $75%$ 18. $Variation in gene frequencies within populations can occur by change rather than by natural selection. This is referred to as$ (1) $Genetic flow$ (2) $Genetic drift$ (3) $Random mating$ (4) $Genetic load$ 19. $A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed the resulting genotypes were in the ratio of:$ (1) $1 : 2 : 1 :: Tall homozygous : Tall heterozygous : Dwarf$ (2) $1 : 2 : 1 :: Tall heterozygous : Tall homozygous : Dwarf$ (3) $3 : 1 :: Tall : Dwarf$ (4) $3 : 1 :: Dwarf : Tall$ 20. $A cross in which an organism showing a dominant phenotype is crossed with the recessive parent in order to know its genotype is called$ (1) $Monohybrid cross$ (2) $Back cross$ (3) $Test cross$ (4) $Dihybrid cross$ 21. $Which Mendelism idea is depicted by a cross in which the F_{1} generation resembles both the parents?$ (1) $co-dominance$ (2) $incomplete dominance$ (3) $law of dominance$ (4) $inheritance of one gene$ 22. $Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Mendel's law of Independent assortment does not hold good for the genes that are located closely on the same chromosome. Reason (R) : Closely located genes assort independently. In the light of the above statements, choose the correct answer from the options given below:$ (1) $Both (A) and (R) are correct but (R) is not the correct explanation of (A)$ (2) $(A) is correct but (R) is not correct$ (3) $(A) is not correct but (R) is correct$ (4) $Both (A) and (R) are correct and (R) is the correct explanation of (A)$ 23. $The mechanism that causes a gene o move from the linkage group to another is called.$ (1) $Duplication$ (2) $Translocation$ (3) $Crossing over$ (4) $Inversion$ 24. $The genotypes of a husband and Wife are I^{A} I^{B} & I^{A} i. Among the blood types of their children, how many different genotypes and phenotypes are possible?$ (1) $3 genotypes ; 4 phenotypes$ (2) $4 genotypes ; 3 phenotypes$ (3) $4 genotypes ; 4 phenotypes$ (4) $3 genotypes ; 3 phenotypes$ 25. $Select the correct match Column-I Column-II$ (1) $Phenylketonuria - Autosomal dominant trait$ (2) $Sickle cell anaemia - Autosomal recessive trait, chromosome-11$ (3) $Thalassemia - X linked$ (4) $Haemophilia - Y linked$ 26. $Taylor conducted the experiments to prove semi conservative mode of chromosome replication on$ (1) $Vicia faba$ (2) $Drosophila melanogaster$ (3) $E. coli$ (4) $Vinca rosea$ 27. $A collection of plants and seeds, having diverse alleles of all the genes of a crop is called$ (1) $Germplasm$ (2) $Gene library$ (3) $Genome$ (4) $Herbarium$ 28. $A colour blind man marries a woman with normal sight who has no history of colour blindness in her family. What is the probability of their grandson (son's son) being colour blind?$ (1) $0.25$ (2) $0.5$ (3) $1$ (4) $Nil$ 29. $In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased?$ (1) $50%$ (2) $75%$ (3) $25%$ (4) $100%$ 30. $The movement of a gene from one linkage group to another is called$ (1) $Inversion$ (2) $Duplication$ (3) $Translocation$ (4) $Crossing over$