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In human, the CCR5 protein is used by strains of HIV-1 to gain entry into cells. The mutant allele of the CCR5 gene contains a 32-bp deletion, making the encoded protein shorter and nonfunctional and blocking the entry of HIV-1 into cells. In a CCR5 genotyping survey of 100individuals, 79 show homozygous for wild-type allele, 20 show heterozygous, and 1 show homozygous for mutant allele. What is the allele frequency of the mutant allele?
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