MCQ on Epistasis with Answers (PDF)

Epistasis is the phenomenon where the expression of one gene is affected by one or more other genes. This interaction can modify or completely mask the phenotypic effects of alleles at another locus. Epistasis is a key aspect of genetic regulation and plays a role in complex traits and disease expression. This is an MCQ on Epistasis with Answers. You can download the quiz as PDF from the results page.

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MCQ on Epistasis

1. 
Which of the following best describes epistasis?

2. 
In a dihybrid cross involving recessive epistasis, the typical phenotypic ratio is:

3. 
In a genetic cross, a 12:3:1 ratio in the offspring indicates:

4. 
Which of the following is an example of epistasis in humans?

5. 
What type of epistasis occurs when two genes both need to be functional for a trait to be expressed?

6. 
In a case of duplicate gene action, the F2 phenotypic ratio typically seen is:

7. 
A cross shows a 9:7 phenotypic ratio in the F2 generation. This suggests:

8. 
In epistasis, the gene that masks the effect of another gene is called:

9. 
Which of the following genetic interactions is NOT an example of epistasis?

10. 
In the inheritance of coat color in mice, the agouti gene is epistatic to:

mcq on epistasis

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