In Hardy-Weinberg problems, the frequency of a homozygous recessive genetic occurrence in a population is q2. So if 1 in 100 people in a population have albinism (homozygous recessive disorder), then we say the frequency is q2=1/100. We then say, to find the frequency of the allele count q, that q=√1/100=1/10. I don't understand why we say this. Why would the allele count be the square root of the population frequency? There are 2 alleles per person. Why isn't it 2q or q/2 instead? I suppose my problem is understanding what exactly p and q are.