In: Biology
Here is a data set on bird populations with color variation. The Y gene is autosomal with a Y allele (yellow plumage) and y allele (brown plumage), where Y is dominant to y (Y > y). The survey shows phenotypic frequencies for a large mainland population on the coast of Ecuador and a small island population. The island population was founded in 1960 by a small flock of birds. Thereafter, there has been some gene flow between the mainland and the island. Answer the following questions based on these data.
Census year Mainland Island
yellow brown yellow brown
1960 4,550 451 4 12
1970 4,157 438 58 78
1980 4,653 399 203 99
1990 4,159 404 367 35