If the number of people with each phenotype of a two allele system is known, then the gene frequency for each of the two alleles can be calculated.
2 * c
2 * d
2 * e
2 * (c+d+e)
(2 * c) + d
d + (2 * e)
frequency of allele X[a] =
= ((2 * c) + d) / (2 * (c+d+e))
frequency of allele X[b] =
= (d + (2 * e)) / (2 * (c+d+e))
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