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How does gene C/c affect the expression of gene A/a in pigmentation of mice?

Option: 1

It enhances the expression of gene A/a

 


Option: 2

It masks the expression of gene A/a in homozygous recessive condition


Option: 3

It masks the expression of gene A/a in homozygous dominant condition

 


Option: 4

It has no effect on the expression of gene A/a


Answers (1)

best_answer

Option b is correct because 

 In pigmentation of mice, gene C/c is epistatic to gene A/a. This means that the expression of gene A/a is masked by gene C/c in homozygous recessive condition. When gene C/c is homozygous recessive, it masks the formation of any color and albino/white coat is produced, regardless of the allele present at locus A. Therefore, option B is the correct answer. 

Option A is incorrect because gene C/c does not enhance the expression of gene A/a.

Option C is incorrect because gene C/c masks the expression of gene A/a in homozygous recessive condition, not homozygous dominant condition.

Option D is incorrect because gene C/c does have an effect on the expression of gene A/a, as it masks its expression in homozygous recessive condition.

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