04.10. A large population of land turtles on an isolated island has two alleles determines shell thickness: The allele for thinner shells is dominant shells. The over the thinner-shell allele occurs at a frequency of 20%. t0 Assuming thick or thin shells, what should there the population? frequency of homozygous thicker-she (Hint: Use a large Punnett square to calculate 49 the answer:) 16% 50% 64