At a certain genetic loci, there are only 3 alleles in a given population. The frequencies of the 3 alleles are represented by p, q and r. If 36% of this population is homozygous for p and 4% homozygous for q, what is the frequency of r in this population?
a) 0.36
b) 0.04
c) 0.2
d) 0.44
e) 0.56
Ans: c) 0.2
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