Problem
In a large population of dogs reproducing in discrete generations by random mating, 91% of the dog are white; the rest are grey. The population may be assumed to be in Hardy-Weinberg equilibrium.
Suppose that colour is controlled by a single gene: doubly-dominant animals AA and heterozygotes Aa are white; homozygous recessives aa are grey.
1. What proportion of dogs are AA?
2. Grey dogs are difficult to sell as pets. A pet dealer suggests to remove all grey dogs from the population and the remaining dogs allowed to mate. He believes that all descendants of the white dogs will be white. Assuming that mating continues at random, does the pet dealer get all white dogs? If no, calculate the percentage of grey dogs he would get.