Dictionary of Human Evolution and Biology

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Directional Selection

Selection that operates monotonically against one end of the range of variation of a trait, and hence over time, tends to shift the entire population mean toward an optimum at the opposite end, such as selection for increased body size. Occurs when individual fitness tends to increase or decrease with the selective value of phenotypic traits. Aka dynamic selection, progressive selection.

Cf. disruptive selection and stabilizing selection.

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