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If the mean of a phenotypic characteristic in a population changes over time but the distribution remains the same, then we say that the population has undergone ____ selection.

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Answer:

Directional selection

Explanation:

In population genetics, directional selection is a mode of natural selection in which the mean of a phenotypic characteristic in a population changes over time but the distribution remains constant.

Directional selection occurs mostly under environmental changes and when populations migrate to new areas with different environmental pressures.

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