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Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 7 (60 MCQs)

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1. In which of the sex determination both male and female have same number of chromosomes?
2. Application of Mendel's law is limited to
3. F2 generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1:2:1. It represents a case of:
4. Mutation can be induced with
5. A specific characteristics. Mendel looked at 7 different ..... in peas such as color and shape.
6. Linkage was discovered by
7. The law based on fact that the characters do not show any blending and both the characters are recovered as such in F2-generation although one character was absent in F1-progeny, is
8. Monohybrid F2 and dihybrid F2 can have the following similarity
9. The number of gametes formed from selfing the F1 generation in a dihybrid cross is
10. On crossing two heterozygous tall plants (Tt), a total of 500 plants were obtained in F$_{1}$ generation. What will be the respective number of tall and dwarf plants obtained in F$_{1}$ generation?
11. In his Cross 1 on Drosophila, T.H.Morgan crossed between-
12. Occasionally, a single gene may express more than one effect. Thephenomenon is called:
13. In most species, mitochondrial DNA is passed down from-
14. What is the probability that a cross between a true breeding pea plant with smooth seeds and a true breeding pea plant with wrinkled seeds will produce F1 progeny with smooth seeds?
15. John has 2 genes for blue eyes. His GENEOTYPE is .....
16. The recessive genes located on X chromosome in humans are always
17. In his classic experiments on garden pea, Mendel did not use
18. IN THE TEST CROSS
19. Person having genotype /$^{A }$/$^{B }$would show the blood group as AB. This is because of
20. The gene that is hidden unless both genes are present.
21. If linkage was known at the time of Mendel then which of the following laws, he would not have been able to explain?
22. Y-linked genes are holandric genes
23. Phenotype of an organism is the result of
24. Which of the following statement is considered to be universal?
25. Fruit color in squash in an example of
26. Chromosomal theory of inheritance was given by
27. A sex linked disorder is
28. Mendel crossed the tall plant from F2 generation with a dwarf plant. Mark the correct statement regarding this.
29. Which of the following statement is not correct about Incomplete dominance?
30. In polygenic inheritance
31. Who discovered X-body in spermatogenesis-
32. In Mendel's experiment, when tall pea plants were crossed with dwarf pea plants, F1 generation showed all tall plants (dominant trait). The recessive trait dwarfness did not get expressed because .....
33. Out of the 832 total plants, the number of recombinant offspring obtained in F2 generation of a dihybrid experiment is
34. In Honeybee, no.of Chromosomes present are-
35. In sickle cell anaemia glutamic acid is replaced by valine. Which one ofthe following triplets codes for valine?
36. The distance between the genes is measured by
37. Which of the following is not a characteristic of Mendel's experiment?
38. Study of inheritance and variation is
39. In the F2 generation of a Mendelian dihybrid cross the number ofphenotypes and genotypes are:
40. Failure of segregation of chromatid during cell division cycle results in the gain or loss of chromosome which as called
41. How many types of gametes is possible with genotype AaBb
42. The types of gametes formed by the genotype RrYy are
43. In a red and white-flowered cross of Mirabilis jalapa, F2 generation has red, pink and white-flowered plants in the ratio of
44. In a cross between plants having yellow round (YYRR) and green wrinkled (yyrr) seeds, what will be the ratio between seeds having yellow and green seed colour?
45. The disease sickle-cell anaemia is caused by the substitution of (i) by (ii) at the (iii) position of (iv) globin chain of haemoglobin molecule.Which of the following correctly fills the blanks in the above statement?
46. According to Mendel's law of segregation, what happens to the alleles during gamete formation?
47. Mustard gas, Phenol and Ammonia are-
48. Which of the following trait shows transmission from carrier female to male progeny?
49. Morgan found ..... of non-parental type in F2 generation in Drosophila when he made a cross between white eyed & miniature winged female with wild-type red eyed & normal winged male.
50. Find the number of phenotypes and genotypes when TtRR is crossed with TtRr
51. Genotype of the blood group is I$^{A}$ I$^{O}$. Find the phenotype?
52. F$_{1}$ individual of the cross AAbb x aaBB was test crossed. If both non-allelic genes are 24 map units apart then calculate the percentage of aaBb:
53. The three autosomal allele that determine the blood group are located in chromosome
54. The allele which expresses itself in both homozygous and heterozygous condition is called
55. 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 disorder.*******IV. Sickle cell anaemia is a X-linked recessive gene disorder
56. In a cross between CcPp X Ccpp, where C and P are dominant genes needed for development of purple colour flower in sweet pea plants; what would be the ratio of plants producing flowers of different colours?
57. A diploid organism is heterozygous for five loci and homozygous for two loci, how many types of gametes are possible?
58. The gene that is expressed. Brown eyes are ..... over blue.
59. The contracting pairs of factors in Mendelian crosses are called
60. If a haemophilic woman marries a normal man
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