27. In a species of land snails, color is determined by a single gene with two alleles: BB individuals are brown, TT individuals are pink, and BT individuals are pink with brown stripes. Researchers studying a large population of these snails sampled 996 individuals and observed the following phenotypic frequencies: Brown: 0.56, Pink: 0.36, Pink with brown stripes: 0.08 What are the expected genotypic frequencies? A. BB: 0.56; TT: 0.36; BT: 0.08 The B allele frequency is 0.56 + (0.5 X 0.08) = B. BB: 0.60; TT: 0.36; BT: 0.04 0.6. The T allele frequency is thus 1 –0.6 = 0.4. C. BB: 0.56; TT: 0.20; BT: 0.24 Expect: BB frequency of 0.62= 0.36; TT frequency ofD. BB: 0.36; TT: 0.16; BT: 0.48 0.42= 0.16; expect BT frequency of 2(0.6 X 0.4) = 0.48 E. BB: 0.36; TT: 0.36; BT: 0.28
28. In a sample of 1000 from a large population there are: 301 A1A1, 598 A1A2, and 101 A2A2 individuals. Is this population in genetic equilibrium?
29. A small number of birds arrive on an island from a neighboring larger island. This small population begins to adapt to the new food plants available on the island, and their beaks begin to change. About twice a year, one or two more birds from the neighboring island arrive. These new arrivals _____.
30. Which of the following processes results in adaptation?