Question

Eye color in a person is determined by a gene. The eye-color gene consists of two alleles,a left allele and a right allele. The possible values of the alleles are B or g. Depending on the combination of alleles, the resulting eye color is as follows:BB, Bg or gB: black eyes gg: green eyes. A person’s left allele is chosen uniformly at random from his mother’s two alleles and his right allele is chosen uniformly at random from the father’s two alleles. A black-eyed woman has black-eyed parents, both of whom are Bg. She and a green-eyed man have a child. Given that the child has black eyes, what is the chance that the woman has a g allele?

Answer 1