In a population of dragonflies, wing structure is determined by two loci (A, B), each with two alleles (A and a, B and b). Abnormal wings are produced in aa individuals unless they possess at least one B allele. This is an example of what evolutionary phenomenon?
A) epistasis
B) linkage equilibrium
C) physical linkage
D) latent variation

Question

Quizplus · Accepted Answer

The phenomenon described is an example of epistasis, which occurs when the expression of one gene affects the expression of another gene. In this case, the expression of the B gene affects the expression of the A gene, so that individuals with certain combinations of alleles at these loci will have abnormal wing structures.

In a Population of Dragonflies, Wing Structure Is Determined by Two