Q4.10. A large population of land turtles on an isolated island has two alleles determines shell thickness. The allele for thinner shells is dominant over the shells. The over the thinner-shell allele occurs at a frequency of 20%. Assuming there was to thick or thin shells, what should the frequency of homozygous thicker-shell population? (Hint: Use a large Punnett square to calculate the answer.) 4% 16% 50% 64%