Dictionary of Human Evolution and Biology

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Stabilizing Selection

1. selection that operates against the extremes of variation and thus tends to stabilize the distribution of a population around the mean. Occurs when individuals with intermediate values for a phenotypic trait have higher fitness values. Aka maintenance selection.

Cf. directional selection and disruptive selection.

2. less well-known (nor accepted) extension by Schmalhausen that a process exists whereby favorable adaptabilities caused by the environment eventually become genetically assimilated adaptations.

Cf. the Baldwin effect.

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