In a village, if the proportion of individuals who have sickle-cell disease is 0.50, and the population is assumed to be at Hardy-Weinberg equilibrium, what is the expected frequency of
the HbS allele? (Hint: What is the genotype of people with sickle-cell disease, and how is that
genotype represented in the Hardy-Weinberg equation?)
A.0.125
B.0.25
C.0.5
D.0.71