Question

genetic factors in inheritance quick check
what is the definition of epistasis? (1 point)
when one gene affects multiple phenotypes
when the allele of one gene interferes with the expression of another gene
when a dominant allele for a specific trait is not completely expressed over the recessive allele
when one trait is determined by multiple genes

Explanation:

Epistasis is a genetic phenomenon. It specifically refers to the situation where one gene's allele impacts another gene's expression. For example, in some flower - color inheritance cases, one gene can mask or modify the effect of another gene related to color. The first option describes pleiotropy (one gene affecting multiple phenotypes). The third option is about incomplete dominance. The fourth option is polygenic inheritance (one trait determined by multiple genes).

Answer:

when the allele of one gene interferes with the expression of another gene