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Q. The peppered moth provides a well-known example of natural selection. The light-coloured form of the moth was predominant in England before the industrial revolution. In the mid-nineteenth century, a dark-coloured form appeared. The difference is formed by a dominant allele of one gene. By about 1900, around 90 percent of the moths around industrial areas were dark coloured, whereas light-coloured moths were still abundant elsewhere. In fact, birds could readily find out the light moths against the soot-darkened background in industrial areas and therefore were eating more light moths. Recently, use of cleaner fuels has greatly reduced soot in the landscape, and dark-coloured moths have been disappearing. Should the two forms of moths be considered separate species?
one of the basic tenets of evolution by natural selection is that evolution requires variation upon which selection acts. How might drift prevent selection from acting?
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