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

[gene pool: the set all of genes in a population] This change was, by definition, evolution.

As a result, more dark moths survived until reproductive age and left offspring. [evolution: a change in the gene pool] In order to understand evolution, it is necessary to view populations as a collection of individuals, each harboring a different set of traits.

The greater number of offspring left by dark moths is what caused their increase in frequency. A single organism is never typical of an entire population unless there is no variation within that population.

Evolution is a change in the gene pool of a population over time.

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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.[evolution: a change in the gene pool] In this moth there are two color morphs, light and dark. By 1898, the 95% of the moths in Manchester and other highly industrialized areas were of the dark type. The moth population changed from mostly light colored moths to mostly dark colored moths.The moths' color was primarily determined by a single gene.

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