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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
According to the Neo-Darwinist, natural selection can be classified into three categories: directional selection, disruptive selection, and stabilizing selection.
Variation in clutch size was subjected to disruptive selection, while variation in egg-mass about the trade-off was subjected to stabilizing selection.
Disruptive selection favors individuals with either of the opposite extremes of a trait and discourages moderation.
We found that there is pronounced opportunity for disruptive selection on brambling egg coloration.
Resembling a homozygote has advantages under both frequency-dependent disruptive selection within populations and under divergent selection between environments.
A popular theory has proposed that anisogamy originated through disruptive selection acting on an ancestral isogamous population.

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