Principles of Inheritance and Variation MCQs Mock Test of Class 12th Biology

Welcome to your Principles of Inheritance and Variation MCQs Mock Test of Class 12th Biology

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Question 1. Select the disease which is caused by recessive autosomal genes when present in homozygous conditions.

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Question 2. Which of the following trait is controlled by dominant autosomal genes ?

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Question 3. Failure of segregation of chromatids during cell division results in the gain or loss of chromosomes, this is called as

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Question 4. Trisomy is represented by

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Question 5. Mongolism is a genetic disorder which is caused by the presence of an extra chromosome number

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Question 6. A cross between two tall plants resulted in offspring having few dwarf plants. What would be the genotypes of both the parents ?

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Question 7. Chromosome maps/genetic maps were first prepared by

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Question 8. The distance between the genes is measured by

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Question 9. Which of the following is suitable for experiment on linkage ?

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Question 10. Distance between the genes and percentage of recontbfnatidnshows

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Question 11. In the F2 generation of a Mendelian dihybrid cross the number of phenotypes and genotypes are

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Question 12. The colour based contrasting traits in seven contrasting pairs, studied by Mendel in pea plant were

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Question 13. _________ pairs of contrasting traits were studied by Mendel in pea plant.

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Question 14. Which of the following characters was not chosen by Mendel ?

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Question 15. Genes which code for a pair of contrasting traits are known as

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Question 16. A recessive allele is expressed in

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Question 17. In a dihybrid cross, if you get 9 : 3 : 3 : 1 ratio it denotes that

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Question 18. Which of the following will not result in variations among siblings ?

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Question 19. Mendel’s Law of independent assortment holds good for genes situated on the

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Question 20. Occasionally, a single gene may express more than one effect. The phenomenon is called

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Question 21. The characters which appear in the first filial generation are called

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Question 22. What will be the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus ?

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Question 23. In a monohybrid cross between two heterozygous individuals, percentage of pure homozygous individuals obtained in F1 generation will be

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Question 24. What is the probability of production of dwarf offsprings in a cross betweeen two heterozygous tall pea plants ?

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Question 25. Which of the following crosses will give tall and dwarf pea plants in same proportions ?

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Question 26. If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is

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Question 27. In sickle cell anaemia glutamic acid is replaced by valine. Which one of the following triplets codes for valine ?

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Question 28. Person having genotype IA IB would show the blood group as AB. This is because of

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Question 29. ZZ/ZW type of sex determination is seen in

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Question 30. Which of the following is incorrect regarding ZW – ZZ type of sex determination ?

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Question 31. A couple has six daughters. What is the possibility of their having a girl next time ?

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Question 32. Number of autosomes present in liver cells of a human female is

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Question 33. Haplodiploidy is found in

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Question 34. Rate of mutation is affected by

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Question 35. Two or more independent genes present on different chromosomes which determine nearly same phenotype are called

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Question 36. Select the incorrect statement regarding pedigree analysis.

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Question 37. To determine the genotype of a tall plant of F2 generation, Mendel crossed this plant with a dwarf plant. This cross represents a

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Question 38. Which of the following is a test cross ?

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Question 39. Mendal formulated the law of purity of gametes on the basis of

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Question 40. The inheritance of flower colour in Antirrhinum (dog flower) is an example of

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Question 41. In Antirrhinum (dog flower), phenotypic ratio in F2 generation for the inheritance of flower colour would be

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Question 42. Phenotypic and genotypic ratio is similar in case of

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Question 43. What can be the blood group of offspring when both parents have AB blood group ?

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Question 44. Inheritance of roan coat in cattle is an example of

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Question 45. ABO blood grouping in human beings cites the example of

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Question 46. In mice, Y is the dominant allele for yellow fur an y is the recessive allele for grey fur. Since Y is lethal when homozygous, the result of cross Yy × Yy will be

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Question 47. How many types of gametes can be produced by a diploid organism who is heterozygous for 4 loci ?

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Question 48. Which of the following is correct for the condition when plant YyRr is back crossed with the double recessive parent ?

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Question 49. Law of independent assortment can be explained with the help of

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Question 50. Mendel’s work was rediscovered by three scientists in the year