Stabilizing selection tends to
genetic diversity within a population.

Question

Stabilizing selection tends to 
 genetic diversity within a population.

BlackTom AI · Accepted Answer

Question restatement: Stabilizing selection tends to _____ genetic diversity within a population.

Option presented: 空白1

Analysis of the option and concept: Stabilizing selection is a form of natural selection that favors average phenotypes and disfavors extreme variations. By promoting individuals with mid-range traits, it reduces the extremes in the population and tends to compress phenotypic variation around the mean. This contraction of variation translates to a decrease in genetic diversity related to those extreme phenotypes, and often reduces overall genetic variance in the trait under selection. In short, stabilizing selection stabilizes the status quo and lowers the range of phenotypes, which corresponds to a reduction in genetic diversity for the affected trait.

Why this option is appropriate: Since the blank corresponds to the concept of stabilizing selection reducing variation, the implied answer should express a decrease in genetic diversity.

Why this option could be considered insufficient if there were alternatives: If other options suggested that diversity increases or remains the same, those would conflict with the core idea that stabilizing selection narrows variation around the mean. However, only one option is provided here (空白1), so the focus is on whether the chosen completion aligns with stabilizing selection’s effect on diversity.

Synthesis: The principle behind stabilizing selection is to favor intermediate phenotypes, which reduces the range of variation and thus decreases genetic diversity for the trait under selection. The provided placeholder option should reflect that decrease in diversity accordingly.

Stabilizing selection tends to genetic diversity within a population.

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