Answer :
Sometimes one gene pair will interact so as to control the expression of a second gene pair in an interaction called epistasis.
Epistasis is a genetic phenomenon in which the effect of a gene mutation is determined by the existence or absence of mutations in one or several other genes, which are referred to as modifier genes. In other words, the mutation's effect is determined by the genetic background within which it emerges.
The term "epistasis" is occasionally utilized to describe some type of statistical interaction among genetic factors, and it is also occasionally used to describe situations in which the effect of one genetic variant is concealed by another variant at another locus.
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