The Peppered Moth Provides a Well-Known Example of Natural Selection

question 26

Multiple Choice

The peppered moth provides a well-known example of natural selection.The light-colored form of the moth was predominant in England before the industrial revolution.In the mid-nineteenth century,a dark-colored form appeared.The difference is produced by a dominant allele of one gene.By about 1900,approximately 90% of the moths around industrial areas were dark colored,whereas light-colored moths were still abundant elsewhere.Apparently,birds could readily find 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 the dark-colored moths have been disappearing.Should the two forms of moths be considered separate species?

• A)Yes,because natural selection has affected the frequency of the two different forms.
• B)Yes,because they have completely different coloration.
• C)Yes,because they are reproductively isolated based on habitat.
• D)Yes,because they have completely different coloration and natural selection has affected the frequency of the two different forms.
• E)No.

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Genetic Predisposition

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