peppered moth

the moth Biston betularia, which has been extensively studied in many areas of Britain. Its coloration is of two main types: peppered (a mixture of white and grey) and melanic (dark brown), the relative proportion of the two colour types in an area being related to the amount of atmospheric pollution. The colour forms are an example of a GENETIC POLYMORPHISM controlled by a single gene with two ALLELES, the allele for melanism being dominant. see INDUSTRIAL MELANISM.

单词	peppered moth
释义	peppered moth peppered moth n (Animals) a European geometrid moth, Biston betularia, occurring in a pale grey speckled form in rural areas and a black form in industrial regions. See also melanism¹ peppered moth peppered moth the moth Biston betularia, which has been extensively studied in many areas of Britain. Its coloration is of two main types: peppered (a mixture of white and grey) and melanic (dark brown), the relative proportion of the two colour types in an area being related to the amount of atmospheric pollution. The colour forms are an example of a GENETIC POLYMORPHISM controlled by a single gene with two ALLELES, the allele for melanism being dominant. see INDUSTRIAL MELANISM.
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