MCQ Questions on Genetics
1. The tendency of an offspring to resemble its parent is known as
(a) Variation
(b) Heredity
(c) Resemblance
(d) Inheritance
Answer
Answer: (b) Heredity
2. Who is known as the “Father of Genetics”?
(a) Morgan
(b) Mendel
(c) Watson
(d) Bateson
Answer
Answer: (b) Mendel
3. The alternate form of a gene is
(a) Alternate type
(b) Recessive character
(c) Dominant character
(d) Allele
Answer
Answer: (d) Allele
4. The genotypic ratio of a monohybrid cross is
(a) 1:2:1
(b) 3:1
(c) 2:1:1
(d) 9:3:3:1
Answer
Answer: (a) 1:2:1
5. The crossing of F1 to any of the parent is known as
(a) Test cross
(b) Back cross
(c) F1 cross
(d) All of the above
Answer
Answer: (b) Back cross
6. Which of the following statements is true regarding the “law of segregation”?
(a) Law of segregation is the law of purity of genes
(b) Alleles separate from each other during gametogenesis
(c) Segregation of factors is due to the segregation of chromosomes during meiosis
(d) All of the above
Answer
Answer: (d) All of the above
7. Homozygosity and heterozygosity of an individual can be determined by
(a) Back cross
(b) Self-fertilization
(c) Test cross
(d) All of the above
Answer
Answer: (c) Test cross
8. An exception to Mendel’s law is
(a) Independent assortment
(b) Linkage
(c) Dominance
(d) Purity of gametes
Answer
Answer: (b) Linkage
9. Pea plants were used in Mendel’s experiments because
(a) They were cheap
(b) They had contrasting characters
(c) They were available easily
(d) All of the above
Answer
Answer: (b) They had contrasting characters
10. The smallest unit of genetic material which produces a phenotypic effect on mutation is
(a) Muton
(b) Gene
(c) Recon
(d) Nucleic acid
Answer
Answer: (a) Muton
11. Mendel’s findings were rediscovered by
(a) Correns
(b) De Vries
(c) Tschermark
(d) All
Answer
Answer: (d) All
12. Alleles are
(a) Alternate forms of genes
(b) Linked genes
(c) Chromosomes that have crossed over
(d) Homologous chromosomes
Answer
Answer: (a) Alternate forms of genes
13. When the activity of one gene is suppressed by the activity of a non-allelic gene, it is known as
(a) Pseudo-dominance
(b) Hypostasis
(c) Epistasis
(d) Incomplete dominance
Answer
Answer: (c) Epistasis
14. Cystic fibrosis is
(a) Sex-linked recessive disorder
(b) Autosomal dominant disorder
(c) Autosomal recessive disorder
(d) Sex-linked dominant disorder
Answer
Answer: (c) Autosomal recessive disorder
15. 9:7 ratio in the F2 generation represents
(a) Incomplete dominance
(b) Co-dominance
(c) Epistasis
(d) Complementary interaction
Answer
Answer: (c) Epistasis
16. A small amount of lethal mutation is always present in the population due to
(a) Positive selection
(b) Negative selection
(c) Frequency-dependent selection
(d) Mutation-selection balance
Answer
Answer: (d) Mutation-selection balance
17. If a plant with genotype AaBb is self-fertilized, the probability of getting AABB genotype will be (A and B are not linked)
(a) ½
(b) ¼
(c) ⅛
(d) 1/16
Answer
Answer: (d) 1/16
18. How many phenotypes can occur in the human blood group ABO with alleles IA IB i?
(a) 2
(b) 3
(c) 4
(d) 1
Answer
Answer: (c) 4
19. The geometrical device that helps to find out all the possible combinations of male and female gametes is known as
(a) Bateson Square
(b) Mendel Square
(c) Punnett Square
(d) Mendel Square
Answer
Answer: (c) Punnett Square
20. Which term represents a pair of contrasting characters?
(a) Heterozygous
(b) Homozygous
(c) Codominant genes
(d) Allelomorphs
Answer
Answer: (d) Allelomorphs