Principles of Inheritance & Variation PYQs Set 2 (PDF)

Back to Principles of Inheritance & Variation

Set 2 of 5 · Questions 31-60 of 129

In the print window choose “Save as PDF”. The file prints without a web address or date line.

Mere Teacher · Previous Year Questions NEET Biology · Principles of Inheritance & Variation · Set 2 (Q31-60)
Scan or visit mereteacher.com for free PYQ practice, timed CBT tests, step-by-step solutions and BroBot AI. Answers and solutions are free with a sign-up.
31. $The recombination frequency between the genes (A) & (C) is 5%, (B) & (C) is 15%, (B) & (D) is 9%, (A) & (B) is 20%, (C) & (D) is 24% and (A) & (D) is 29%. What will be the sequence of these genes on a linear chromosome?$ (1) $(D), (B), (A), (C)$ (2) $(A), (B), (C), (D)$ (3) $(A), (C), (B), (D)$ (4) $(A), (D), (B), (C)c$ 32. $If a colour blind female marries a man whose mother was also colour blind, what are the chances of her progeny having colour blindness?$ (1) $100 %$ (2) $25 %$ (3) $50 %$ (4) $75 %$ 33. $The genotype of a plant showing the dominant phenotype can be determined by:$ (1) $Pedigree analysis$ (2) $Back cross$ (3) $Test cross$ (4) $Dihybrid cross$ 34. $Chromosomal theory of inheritance was proposed by :$ (1) $Sutton and Boveri$ (2) $Bateson and Punnet$ (3) $T. H. Morgan$ (4) $Watson and Crick$ 35. $The production of gametes by the parents, the formation of zygotes, the F_{1} and F_{2} plants, can be understood using :-$ (1) $Pie diagram$ (2) $A pyramid diagram$ (3) $Punnet square$ (4) $Venn diagram$ 36. $Identify the wrong statement with reference to the gene 'I' that controls ABO blood groups.$ (1) $Allele 'i' does not produce any sugar.$ (2) $The gene (I) has three alleles.$ (3) $A person will have only two of the three alleles.$ (4) $When IA and IB are present together, they express same type of sugar.$ 37. $How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments?$ (1) $Six$ (2) $Eight$ (3) $Seven$ (4) $Five$ 38. $The phenomenon of pleiotropism refers to$ (1) $more than two genes affecting a single character.$ (2) $presence of several alleles of a single gene controlling a single crossover.$ (3) $presence of two alleles, each of the two genes controlling a single trait.$ (4) $a single gene affecting multiple phenotypic expression.$ 39. $Select the correct statement from the ones given below with respect to dihybrid cross.$ (1) $Tightly linked genes on the same chromosome show higher recombinations.$ (2) $Genes far apart on the same chromosome shows very few recombinations.$ (3) $Genes loosely linked on the same chromosome show similar recombinations as the tightly linked ones.$ (4) $Tightly linked genes on the same chromosome show very few recombinations.$ 40. $The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by$ (1) $T.H. Morgan$ (2) $Gregor J. Mendel$ (3) $Alfred Sturtevant$ (4) $Sutton Boveri$ 41. $If two persons with 'AB' blood group marry and have sufficiently large number of children, these children could be classified as 'A' blood group : 'AB' blood group 'B' blood group in 1 : 2 : 1 ratio. Modern technique of protein electrophoresis reveals presence of both 'A' and 'B' type proteins in 'AB' blood group individuals. This is an example of :$ (1) $Complete dominance$ (2) $Codominance$ (3) $Incomplete dominance$ (4) $Partial dominance$ 42. $The number of contrasting characters studied by Mendel for his experiments was:$ (1) $14$ (2) $4$ (3) $2$ (4) $7$ 43. $In Antirrhinum, two plants with pink flowers were hybridized. The F1 plants produced red, pink and white flowers in the proportion of 1 red, 2 pink and 1 white. What could be the genotype of the two plants used for hybridization of Red flower colour is determined by RR, and white by rr genes?$ (1) $rrrr$ (2) $RR$ (3) $Rr$ (4) $rr$ 44. $A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by :-$ (1) $Only daughters$ (2) $Only sons$ (3) $Only grandchildren$ (4) $Both sons & daughters$ 45. $Two genes R and Y are located very close on the chromosomal linkage map of maize plant. When RRYY and rryy genotypes are hybridized, the F_{2} segregation will show :-$ (1) $Higher number of the recombinant types.$ (2) $Segregation in the expected 9:3:3:1 ratio.$ (3) $Segregation in 3:1 ratio.$ (4) $Higher number of the parental types$ 46. $The fruit fly Drosophila melanogaster was found to be very suitable for experimental verification of chromosomal theory of inheritance by Morgan and his colleagues because$ (1) $It reproduces parthenogenetically.$ (2) $A single mating produces two young flies.$ (3) $Smaller female is easily recognisable from larger male.$ (4) $It completes the life cycle in about two weeks$ 47. $Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement :$ (1) $Both are due to a quantitative defect in globin chain synthesis$ (2) $Thalassemia is due to less synthesis of globin molecules$ (3) $Sickel cell anemia is due to a quantitative problem of globin molecules$ (4) $Both are due to a qualitative defect in globin chain synthesis$ 48. $If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is:-$ (1) $0.75$ (2) $1$ (3) $0$ (4) $0.5$ 49. $A man with blood group ‘A’ marries a woman with blood group ‘B’. which are all the possible blood groups of their offsprings?$ (1) $A and B only$ (2) $A, B and AB only$ (3) $A, B, AB and O$ (4) $O only$ 50. $The incorrect statement with regard to Haemophilia is :$ (1) $A single protein involved in the clotting of blood is affected$ (2) $It is a sex-linked disease$ (3) $It is a recessive disease$ (4) $It is a dominant disease$ 51. $Which one of the following cannot be explained on the basis of Mendel's Law of Dominance?$ (1) $Alleles do not show any blending and both the characters recover as such in F_{2} generation$ (2) $Factors occur in pairs$ (3) $The discrete unit controlling a particular character is called a factor$ (4) $Out of one pair of factors one is dominant and the other recessive$ 52. $Which of the following occurs due to the presence of autosome linked dominant trait?$ (1) $Myotonic dystrophy$ (2) $Haemophilia$ (3) $Thalessemia$ (4) $Sickle cell anaemia$ 53. $What is the expected percentage of F_{2} progeny with yellow and inflated pod in dihybrid cross experiment involving pea plants with green coloured, inflated pod and yellow coloured constricted pod ?$ (1) $100%$ (2) $56.25%$ (3) $18.75 %$ (4) $9%$ 54. $In a testcross involving F_{1} dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates :-$ (1) $The two genes are located on two different chromosomes.$ (2) $Chromosomes failed to separate during meiosis.$ (3) $The two genes are linked and present on the same chromosome.$ (4) $Both of the characters are controlled by more than one gene$ 55. $A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that his cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is containing more number of chromosomes as compared to other, dividing cells. This would result in:$ (1) $Aneuploidy$ (2) $Polyploidy$ (3) $Somaclonal variation$ (4) $Polyteny$ 56. $XO type of sex determination can be found in:$ (1) $Monkeys$ (2) $Drosophila$ (3) $Birds$ (4) $Grasshoppers$ 57. $Which of the following statements is not true of two genes that show 50% recombination frequency?$ (1) $If the genes are present on the same chromosome, they undergo more than one crossovers in every meiosis$ (2) $The genes may be on different chromosomes$ (3) $The genes are tightly linked$ (4) $The genes show independent assortment$ 58. $Experimental verification of the chromosomal theory of inheritance was done by:$ (1) $Sutton$ (2) $Boveri$ (3) $Morgan$ (4) $Mendel$ 59. $The production of gametes by the parents, formation of zygotes, the F_{1} and F_{2} plants, can be understood from a diagram called :$ (1) $Bullet square$ (2) $Punch square$ (3) $Punnett square$ (4) $Net square$ 60. $Which of the following occurs due to the presence of autosome linked dominant trait?$ (1) $Thalassemia$ (2) $Sickle cell anaemia$ (3) $Myotonic dystrophy$ (4) $Haemophilia$