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[gene: a hereditary unit] So, the change in frequency of dark colored moths represented a change in the gene pool.

The moths' color was primarily determined by a single gene.The increase in relative abundance of the dark type was due to natural selection.The late eighteen hundreds was the time of England's industrial revolution.For example, in the previous example, the frequency of black moths increased; the moths did not turn from light to gray to dark in concert.The process of evolution can be summarized in three sentences: Genes mutate.