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A gene is a hereditary unit that can be passed on unaltered for many generations.The gene pool is the set of all genes in a species or population. Kettlewell found that dark moths constituted less than 2% of the population prior to 1848.

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I attempt to explain basics of the theory of evolution and correct many of the misconceptions.

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

Against a sooty background, birds could see the lighter colored moths better and ate more of them.

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.

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