Question

A gene interaction in which a pair of recessive genes at one locus prevents expression of a dominant allele at another locus is called

A) Codominance
B) Polygenic Inheritance
C) Epistasis
D) Incomplete Dominance

Answer 1

Epistasis is the interaction where a pair of recessive genes at one locus prevents expression of a dominant allele at another locus, necessary for pigment production in mice.

Step-by-step explanation:

The type of gene interaction in which a pair of recessive genes at one locus prevents the expression of a dominant allele at another locus is called epistasis. Epistasis occurs when the expression of one gene is dependent on the presence of one or more 'modifier genes'. An example of epistasis is the pigmentation in mice. A mouse that has the recessive c allele will be albino due to the absence of pigment, regardless of the A allele present for coat color. In this case, the gene for pigment production (gene C) is epistatic to the gene controlling the fur color (gene A).