- A) 9:03:04
- B) 9:3:3:1
- C) 12:03:01
- D) 9:7
Genetics MCQ
Total MCQ: 20
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12 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
13 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
14 What is epistasis?
- A) A form of gene interaction
- B) A type of mutation
- C) A DNA replication error
- D) A transcription factor
15 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
16 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
17 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
18 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
19 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
20 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