Disruptive (Diversifying) Selection
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Disruptive, or diversifying, selection favors two or more phenotypic extremes simultaneously while selecting against the intermediate phenotype, increasing overall population variation.
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Beach-dwelling mice colored to match either sand or grass patches survive better than intermediate-colored mice that blend with neither.
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Disruptive selection increases variation by favoring extremes together — this is the opposite outcome from stabilizing selection's single favored average.