MCQ on Genetics with Answers

MCQ on Genetics

1. An individual’s collection of genes is called______

(a) Genotype

(b) Phenotype

(c) Trait

(d) None of the above

2. Name the scientist who descovered the laws of Heredity.

(a) Gregor Mendel

(b) Newton

(c) Punnett

(d) None of the above

3. Who introduced chromosomal theory of inheritance?

(a) Mendel

(b) Sutton

(c) Reginald

(d) Boyen

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

(a) autosomal dominant

(b) autosomal recessive

(c) sex-linked dominant

(d) sex-linked recessive.

5. The plant Mendel used to study inheritance of two genes is____________

(a) Apple

(b) Mango

(c) Garden pea

(d) Potato

6. The allele which is unable to express its effect in the presence of another is called____________

(a) Co-dominant

(b) Supplementary

(c) Complementary

(d) Recessive

7. A plant having the genotype AABbCC will produce ______ kinds of gametes.

(a) 5

(b) 4

(c) 3

(d) 2

8. Female heterogamety is______________

(a) Two different types of gametes are produced by females

(b) Four different types of gametes are produced by males

(c) Can be both (a) and (b)

(d) None of these

9. Which one from those given below is the period for Mendel’s hybridisation experiments?

(a) 1856-1863

(b) 1857-1869

(c) 1840-1850

(d) 1870-1877

10. Among the following characters, which one was not considered by Mendel in his experiments of

(a) Stem-Tall or Dwarf

(b) Trichomes – Glandular or non-glandur

(c) Seed – Green or Yellow

(d) Pod – Inflated or constricted

11. 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 genotype were in the ratio of________

(a) 1:2:1:: Tall heterozygous: lall homozygous: Dwarf

(b) 3:1:: Tall: Dwarf

(c) 3:1:: Dwarf: Tall

(d) 1:2:1: Tall homozygous: lall heterozygous: Dwarf

12. Which is the most common mechanism of genetic variation in the population of sexually reproducing organism?

(a) Transduction

(b) Chromosomal aberrations

(c) Genetic drift

(d) Recombination

13. The movement of a gene from one linkage group of another is called_______

(a) Inversion

(b) Translocation

(c) Duplication

(d) Crossing over

14. 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 would be colour blind?

(a) 25%

(b) 50%

(c) 0%

(d) 75%

15. A human female with Turner’s syndrome____________

(a) has 45 chromosomes with XO

(b) has one additional X chromosome

(c) exhibits male characters

(d) is able to produce children with normal husband

16. If both parent are carriers for thalassemia, which is an autosomal recessive disorders, what are the chances of pregnancy resulting in an affected child?

(a) No chance

(b) 25%

(c) 50%

(d) 100%

17. In a monohybrid cross between two heterozygous individuals, percentage of pure homozygous individuals obtained in F1 generation will be_____________

(a) 25 %

(b) 50 %

(c) 75 %

(d) 100 %

18. A man marries a woman and both do not show any apparent traits of inherited disease. Five sons and two daughters are born, and three of their sons suffer from a disease. However, none of the daughters is affected. The following mode of inheritance for the disease is__________

(a) Sex-linked recessive

(b) Sex-linked dominant

(c) Autosomal dominant

(d) None of the above

19. A trait that “overpowers” and hide another trait is called___________

(a) Overpowering trait

(b) Complex trait

(c) Recessive trait

(d) Dominant Trait

20. Mendal’s law can be applicable only when_________

(a) Characters are linked

(b) Parents are pore breed

(c) F1 generation in monohybrid cross show 2 type of individuals

(d) Onepair of contrasting characters depends on another pair

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