Disruptive selection, also called diversifying selection, describes changes in population genetics in which extreme values for a trait are favored over intermediate values. In this case, the variance of the trait increases and the population is divided into two distinct groups. == Example == Suppose there is a population of rabbits. The color of t...
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http://en.wikipedia.org/wiki/Disruptive_selection
(from the article `evolution`) Two or more divergent phenotypes in an environment may be favoured simultaneously by diversifying selection. ( the right column of the figure.) No ...
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http://www.britannica.com/eb/a-z/d/57
Individuals with extreme trait values have greatest fitness. E.g. selection on bill size in the black-bellied seedcracker â€` Pyrenestes o. ostrinus. This species of African finch exhibits non-sex related polymorphism in bill size. Members of the species have either one of two bill morphs; bills are relatively small or relatively large. The morp...
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http://www.encyclo.co.uk/local/20206
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