Epistasis is ________.
A) another term for overdominance
B) when one gene can mask the expression of a second gene
C) a trait that is only expressed in one sex of the species
D) when two dominant alleles can be expressed in the same individual
E) None of these choices are correct.

Question

Epistasis is ________.
A) another term for overdominance
B) when one gene can mask the expression of a second gene
C) a trait that is only expressed in one sex of the species
D) when two dominant alleles can be expressed in the same individual
E) None of these choices are correct.

Quizplus · Accepted Answer

Epistasis is when one gene can mask the expression of a second gene. It is different from overdominance, which is when a heterozygote has a higher fitness than either homozygote. It also does not have to be related to a specific sex and does not involve two dominant alleles being expressed simultaneously.

Epistasis Is ________