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Disruptive selection
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== Example == Suppose there is a population of rabbits. The colour of the rabbits is governed by two incompletely dominant traits: black fur, represented by "B", and white fur, represented by "b". A rabbit in this population with a [[genotype]] of "BB" would have a [[phenotype]] of black fur, a genotype of "Bb" would have grey fur ([[Incomplete Dominance]]), and a genotype of "bb" would have white fur. If this population of rabbits occurred in an environment that had areas of black rocks as well as areas of white rocks, the rabbits with black fur would be able to hide from predators amongst the black rocks, and the rabbits with white fur likewise amongst the white rocks. The rabbits with grey fur, however, would stand out in all areas of the habitat, and would thereby suffer greater predation. As a consequence of this type of selective pressure, our hypothetical rabbit population would be disruptively selected for extreme values of the fur colour trait: white or black, but not grey. This is an example of [[underdominance]] (heterozygote disadvantage) leading to disruptive selection.
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