Question

% babies born at different weights
which statement is a valid claim that could be made using the data in the graph?
○ directional selection is occurring because the graph favors an extreme.
○ stabilizing selection is occurring because the average is favored.
○ disruptive selection is occurring because the two extremes are favored.
○ biodiversity variation is occurring because there is an increase in trait variation.

Explanation:

First, analyze the graph: it is a bell curve, meaning the middle (average) weight category has the highest percentage of babies, while the extreme weight categories (very low and very high) have the lowest percentages.

• Directional selection favors one extreme trait, which does not match the graph.
• Stabilizing selection favors the average (non-extreme) trait, which aligns with the bell curve shape where the middle weight is most common.
• Disruptive selection favors both extremes, which is the opposite of the graph's pattern.
• The graph does not show an increase in trait variation, so the biodiversity variation claim is invalid.

Answer:

Stabilizing selection is occurring because the average is favored.