What change is observed in a distribution curve for a trait affected by directional selection? (1 point)

Question

• It shifts to the right and to the left.
• It shifts either to the right or to the left.
• It shifts to the right.
• It shifts to the left.

Answer 1

The correct answer is: It shifts either to the right or to the left.

In directional selection, one extreme phenotype is favored over others, leading to a shift in the distribution curve in the direction of that favored phenotype. This can result in a shift either to the right or to the left depending on which extreme is advantageous.