SAT Subject Biology Practice Question 187: Answer and Explanation

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Question: 187

17. This can result in stabilizing selection in a population.

A. Founder effect
B. Heterozygote advantage
C. Population bottleneck
D. Random mating
E. Reproductive isolation

Correct Answer: B

Explanation:

Heterozygote advantage confers a fitness advantage on heterozygous individuals. The amount of variance for the phenotype will decrease, though the mean will stay the same. On a graph of frequency vs. phenotype, this is depicted as a narrowing of the curve.

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