Certified Texas Contract Manager Practice Exam

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In a plant population, individuals of intermediate height leave more offspring than either very short or very tall plants. What is the expected evolutionary effect?

The mean will shift toward greater height Phenotypic variance will increase Phenotypic variance will decrease around the intermediate optimum Both extremes will increase in frequency

Correct Answer:

Phenotypic variance will decrease around the intermediate optimum

Explanation:

Stabilizing selection favors intermediate phenotypes and removes extremes, typically reducing variation around the optimum.

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