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Class 12 Biology Chapter 5 Principles Of Inheritance And Variation Quiz 1 (60 MCQs)

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1. Skin color in humans is an example of
2. There are more right-handed people in the world.
3. If both parents are carriers for thalassemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child
4. Which one is sex-linked disease in man?
5. Linked genes on homologous chromosome can be separated due to
6. Person having genotype IA IB would show the blood group as AB. This isbecause of:
7. Select the disease which is caused by recessive autosomal genes when present in homozygous condition
8. In a monohybrid cross between two heterozygous individuals, percentage of pure homozygous individuals obtained in F$_{1}$ generation will be
9. I. Short statured body with small round head. II. Furrowed tongue and partially opened mouth. III. Palm is broad with characteristic palm crease. IV. Slow physical, psycomotor and mental development. These are the characters of
10. XO type of sex determination and XY type of sex determination are the examples of
11. Which of the following related to genetics is universally applicable?
12. How many gametes are required for F2 generation of a monohybrid cross?
13. If your genotype is Bb, then you can only pass a B or b to your child but you can't pass both.
14. The human blood group AB, is coded by genes that shows .....
15. Which of the following will not result in variation among siblings
16. A human male produces sperms with the genotype AB, Ab, aB and ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person?
17. Which one from those given below is the period for Mendels hybridization experiments
18. Which one of the following is an example of polygenic Inheritance
19. ..... are cells that join to make offspring
20. ABO blood groups is determined by
21. The term 'linkage'was coined by
22. In four o' clock plants, the gene for red flower colour (R) is in incompletely dominant over the gene for white flower colour (r), hence the plants heterozygous for flower colour (Rr) have pink flowers. What will be the ratio of offsprings in a cross between red flowers and pink flowers?
23. Which of the following trait is controlled by sex linked recessive genes?
24. Who rediscovered Mendel's work and when-
25. Which of the following statement correctly explains the four type of phenotypes in the ratio of 9:3:3:1 in a dihybrid cross?
26. What is true about the crossing over between linked genes?
27. A character that appears in a homozygous condition is called
28. Which one of the following Mendelian traits can be expressed in the presence of its identical allele only?
29. Point mutation may occur due to
30. The genetic makeup of an organism. John has 2 genes that are homozygous recessive for eye color {e e }
31. In mendelian dihybride cross, when heterozygous round yellow are self-crossed, round green offspring are represented by the genotype.
32. Assertion:At F2 stage in monohybrid cross, both parental traits are expressed in the proportion of 3:1.Reason:The contrasting parental traits show blending at F2 stage.
33. What are the genes that are passed from parents to offspring called?
34. What would be blood groups of heterozygous father with blood group B & mother homozygous for A?
35. A cross between AA and aa will produce an F1 progeny
36. When F1 hybrids crossed with either of the parent, it is called
37. Linkage reduces the frequency of
38. An individual's collection of genes is called .....
39. To determine the genotype of tall plant of F$_{2}$ generation, Mendel crossed this plant with a dwarf plant. This cross represents a
40. A marriage between a colourblind man and a normal woman produces.
41. Blood group in Humans is an example of
42. All genes located on the same chromosome
43. When Aa is crossed with aa A-dominanta-recessive
44. The cross between white eyed female Drosophila and a red eyed male Drosophila would lead to the production of
45. In a dihybrid cross if you get 9:3:3:1 ratio, it denotes that
46. The weight of fruit in a plant is determined by the number of dominant alleles of a certain number of genes. If nine weight categories are noticed, how many gene loci would be involved?
47. How many types of gametes can be produced by a diploid organism who is heterozygous for loci?
48. The two polynucleotide chains in DNA are
49. The exposure of X rays enhances the frequency of
50. The syndrome in which individual somatic cell contains 3 sex chromosomes XXX Is called
51. Sickle-cell anaemia is a classical example of
52. Mendel's Law of independent assortment holds good for genes situatedon the:
53. In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with green seeded plant, what ratio of yellow and green seeded plants would you expect in F$_{1}$-generation.
54. Gene A and B are linked and 12 map units apart. A heterozygous individual, whose parents were AAbb and aaBB, would be expected to produce gamete in the following frequencies-
55. In fruit flies, long wing is dominant to vestigial wing. When heterozygous long-winged flies were crossed with vestigial-winged flies, 192 offsprings were produced. If an exact Mendelian ratio had been obtained, then the number of each phenotype would have been
56. ONE TRAIT CAN BE INFLUENCED BY MORE THAN ONE GENES, THIS IS THE CASE OF
57. Cystic fibrosis is
58. Mutation due to Change in a single base pair of DNA is-
59. A man having the genotype EEFfGgHH can produce P number of genetically different sperms, and a woman of genotype IiLLMmNn can generate Q number of genetically different eggs. Determine the values of P and Q.
60. The cause(s) for mendelian disorders is/are
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