Both extremes of an array of phenotypes are favored in__________.

Question

BlackTom AI · Accepted Answer

The question asks: 'Both extremes of an array of phenotypes are favored in__________.'

Option 1: 'directional selection' — This pattern occurs when one extreme phenotype is favored over others, causing the population mean to shift in one direction. It does not favor both extremes, so this is not the correct description for the given scenario.

Option 2: 'stabilizing selection' — Stabilizing selection favors average or intermediate phenotypes, reducing variation and pushing extremes toward the mean. Since the prompt specifies that both extremes are favored, stabilizing selection is not the correct mechanism here.

Option 3: 'disruptive selection' — This is the key concept where individuals with extreme phenotypes at both ends of the spectrum have higher fitness than those with intermediate phenotypes. Therefore, both extremes are favored, matching the description in the question.

Option 4: 'gene flow' — Gene flow refers to the movement of alleles between populations, which can affect allele frequencies but does not specifically describe selection for extreme phenotypes within a single population. It is not the mechanism described by the prompt.

Option 5: 'genetic drift' — Genetic drift involves random changes in allele frequencies due to chance, especially in small populations, and is not inherently about favoring phenotypic extremes. It does not explain why both extremes would be favored.

In summary, only disruptive selection fits the scenario where both extremes of a phenotype distribution are favored, while the other options describe different evolutionary processes or patterns that do not produce consistent advantage for extreme phenotypes.

Both extremes of an array of phenotypes are favored in__________.单项选择题

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