In Drosophila, yellow eyes, Y, are dominant to grey eyes, y. In an experiment, Dr. D breeds two individuals, one with yellow eyes and the other with grey. He finds the offspring to be 131 yellow and 58 grey.
What are the genotypes of the adult that were crossed?
What is the expected proportion of individuals in each group and do these numbers significantly differ?
Are there other possible genotypes for the adults? Is there statistical support for them?