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What is disruptive selection?

What is disruptive selection? Here are some definitions.

Noun
  1. A form of natural selection in which extreme values for a trait are favored over intermediate values, causing subpopulations of a single species within the same habitat to develop different adaptations.
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Examples
Variation in clutch size was subjected to disruptive selection, while variation in egg-mass about the trade-off was subjected to stabilizing selection.
We found that there is pronounced opportunity for disruptive selection on brambling egg coloration.
In contrast, the evolution of control may lead to disruptive selection, and ultimately dimorphism of extreme strains.
A popular theory has proposed that anisogamy originated through disruptive selection acting on an ancestral isogamous population.
Secondly, disruptive selection is selection for extreme trait values and often results in two different values becoming most common, with selection against the average value.
Resembling a homozygote has advantages under both frequency-dependent disruptive selection within populations and under divergent selection between environments.

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