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Home » MCQ on Epistasis

Genetics MCQ

Total MCQ: 20

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11 In the case of an epistatic gene affecting two different phenotypic traits, what is this interaction called?

  • A) Pleiotropy
  • B) Polygenic inheritance
  • C) Epistatic interaction
  • D) Complementary gene action
View Answer & Discuss

12 Which term describes a situation where one gene affects the expression of a second gene?

  • A) Epistasis
  • B) Codominance
  • C) Incomplete dominance
  • D) Incomplete penetrance
View Answer & Discuss

13 In a dihybrid cross involving two genes with recessive epistasis, what is the expected phenotypic ratio?

  • A) 9:03:04
  • B) 9:3:3:1
  • C) 12:03:01
  • D) 9:7
View Answer & Discuss

14 What does a 9:7 phenotypic ratio in a dihybrid cross usually indicate?

  • A) Duplicate recessive epistasis
  • B) Dominant epistasis
  • C) Recessive epistasis
  • D) No epistasis
View Answer & Discuss

15 Which of the following is an example of dominant epistasis in humans?

  • A) Blood type inheritance
  • B) Albinism
  • C) Eye color
  • D) Sickle cell anemia
View Answer & Discuss

16 What is epistasis?

  • A) A form of gene interaction
  • B) A type of mutation
  • C) A DNA replication error
  • D) A transcription factor
View Answer & Discuss

17 Which of the following describes a recessive epistatic interaction?

  • A) One gene hides the effect of another gene
  • B) One gene enhances the effect of another gene
  • C) Both genes are equally dominant
  • D) One gene is lethal to another
View Answer & Discuss

18 In a recessive epistatic relationship, what phenotype is expressed?

  • A) The phenotype of the epistatic gene
  • B) The phenotype of the hypostatic gene
  • C) A combination of both genes
  • D) Only the dominant phenotype
View Answer & Discuss

19 In a dominant epistatic interaction, what is the expected phenotypic ratio of a dihybrid cross?

  • A) 9:3:3:1
  • B) 12:03:01
  • C) 9:7
  • D) 15:1
View Answer & Discuss

20 In the case of duplicate recessive epistasis, what phenotypic ratio is typically observed?

  • A) 9:3:3:1
  • B) 9:7
  • C) 15:1
  • D) 9:06:01
View Answer & Discuss
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