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Thats what did happened, youre right G1O. It's a simple case of directional selection. the number of dark moths drastically increased at the time of Britains industrial revolution, cause the white ones were eaten alot more, and so the dark ones could survive and breed - survival of the fittest. There was a move in the distribution of the phenotype so that the mode coincides with a new environmental optimum. There is a shift towards an extreme - directional selection.
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