A dominant allele in the population

A dominant allele in the population. Insects give them protective coloration on vegetation darkened by soot in heavily industrialized areas prior to air pollution regulation. In one heavily polluted area near Birmingham, England in 1956, 82% of the moths of the species Biston betularia were black due to the presence of a dominant gene for melanism. Estimate the frequency of the dominant allele in this population, and the proportion of black moths that are homozygous.