Zoology
A population is in Hardy- weinberg equilibrium for a gene with only two alleles. If the gene frequency of an allele 
is 0.7 , the genotype frequency of 
is
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Zoology
For a gene with two alleles, A (dominant) and a (recessive), if the frequency of 
is 
and the frequency of 
is 
, then the frequencies of the three possible genotypes (AA, Aa, and aa) can be expressed by the Hardy-Weinberg equation: 
where, 
frequency of AA (homozygous dominant) individuals, 
= frequency of Aa (heterozygous) individuals and 
frequency of aa (homozygous recessive) individuals. The equation can be used to calculate allele frequencies if the numbers of homozygous recessive individuals in the population is known. Here, 
and 
(given)
(frequency of heterozygote)
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