One extreme of an array of phenotypes is favored.
A)directional selection
B)stabilizing selection
C)disruptive selection
D)guppies with pike cichlids and killifish
E)guppies with killifish

Question

Quizplus · Accepted Answer

Directional selection occurs when one extreme of a phenotype is favored over the other, causing a shift in the population towards that extreme. This is the best choice because it directly corresponds with the statement given in the question. Stabilizing selection would favor the middle range of phenotypes, while disruptive selection would favor both extremes and result in a bimodal distribution, neither of which match the statement given. The examples provided with guppies and other fish do not provide enough information to determine the type of selection occurring.

One Extreme of an Array of Phenotypes Is Favored