Which mode(s) of selection lead(s) to a reduction in variation but no change in the mean?
A) Stabilizing selection only
B) Directional selection only
C) Disruptive selection only
D) Both stabilizing and disruptive selection
E) Both directional and disruptive selection

Question

Quizplus · Accepted Answer

Stabilizing selection favors the individuals with intermediate traits, reducing the variation in the population. However, it does not change the mean of the trait as it does not favor any extreme values. Therefore, option A is correct. Option B (directional selection) leads to a shift in the mean but also can reduce variation, while option C (disruptive selection) can increase variation but also can change the mean. Option D (stabilizing and disruptive selection) and E (directional and disruptive selection) are incorrect because they include directional or disruptive selection, which alter the mean of the trait.

Which Mode(s) of Selection Lead(s) to a Reduction in Variation