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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
A popular theory has proposed that anisogamy originated through disruptive selection acting on an ancestral isogamous population.
According to the Neo-Darwinist, natural selection can be classified into three categories: directional selection, disruptive selection, and stabilizing selection.
In contrast, the evolution of control may lead to disruptive selection, and ultimately dimorphism of extreme strains.
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.
Disruptive selection favors individuals with either of the opposite extremes of a trait and discourages moderation.
Variation in clutch size was subjected to disruptive selection, while variation in egg-mass about the trade-off was subjected to stabilizing selection.

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