What is the frequency of the recessive (attached ear lobe) allele in the Chinese population?
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In humans, unattached earlobes are dominant, and attached earlobes are recessive. In China, it is reported that 64% of the population exhibit unattached earlobes.
As 64% had unattached, p = 0.64 so q= 0.36. The frequency of the recessive allele consists of the recessive homozygous and the heterozygous group. So to find out the total, sub those values into the 2pq+q^2 to get 0.6.