In the grove snail (Cepaea nemoralis), shell colour is controlled by a single gene. The allele for a pink shell, AAA, is dominant to the allele for a yellow shell, aaa.
A population of these snails contains 84%84\%84% pink-shelled snails.
Use the Hardy–Weinberg equation to calculate the percentage of snails in this population that are heterozygous for this gene.
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