Question

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

Explanation:

• The first option describes incomplete dominance, not epistasis.
• The second option refers to polygenic inheritance, not epistasis.
• The third option defines pleiotropy, not epistasis.
• The fourth option matches the biological definition of epistasis, where one gene's allele impacts the expression of another gene.

Answer:

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