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(C) Natural selection can lead to three different types of changes in the distribution of traits in a population:$1$. Stabilizing selection: More indi

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More individuals acquire value other than the mean character value at any one end of distribution curve.

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(C) Natural selection can lead to three different types of changes in the distribution of traits in a population:$1$. Stabilizing selection: More individuals acquire the mean character value,making the peak higher and narrower.$2$. Directional selection: More individuals acquire a value other than the mean character value at any one end of the distribution curve,causing the peak to shift in one direction.$3$. Disruptive selection: More individuals acquire peripheral character values at both ends of the distribution curve,leading to the formation of two peaks.Therefore,directional change occurs when more individuals acquire a value other than the mean character value at any one end of the distribution curve.

Natural selection leads to the directional change when:

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The theory of natural selection is based on which of the following?

$A$: Due to the bottleneck effect,among the survivors,certain alleles may be overrepresented,some may be underrepresented,and some alleles may be totally eliminated.
$R$: The path of extinction of a species cannot be reversed due to the bottleneck effect.

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