[Campbell Biology P.330] According to the text, what is the definition of epistasis? | Practice Question
According to the text, what is the definition of epistasis?
A: A single gene affecting multiple phenotypic characters.
B: The phenotypic expression of a gene at one locus alters that of a gene at a second locus.
C: An additive effect of two or more genes on a single phenotypic character.
D: The alleles for a character separate during gamete formation.
Explanation
The text explicitly defines epistasis as when 'the phenotypic expression of a gene at one locus alters that of a gene at a second locus.' This is the core concept of the section.