What is the definition of epistasis?

Question

A:When one trait is determined by multiple genes

B:When a dominant allele for a specific trait is not completely expressed over the recessive allele

C:When one gene affects multiple phenotypes

D:When the allele of one gene interferes with the expression of another gene

Answer 1

The correct definition of epistasis is:

D: When the allele of one gene interferes with the expression of another gene.

Epistasis involves the interaction between genes, where the presence of a particular allele at one gene can mask or modify the expression of alleles at another gene.