A brown-eyed man married a blue-eyed woman. Both children were born with brown eyes.

A brown-eyed man married a blue-eyed woman. Both children were born with brown eyes. Determine the genotypes of all the persons mentioned. The gene that determines brown eye color is dominant.

Let’s designate the gene responsible for brown eyes – A, blue eyes – a. The mother’s genotype is aa.

The genotype of children with brown eyes is Aa. As for the genotype of the brown-eyed father, it can be Aa and AA. If the number of children born to him in his marriage were greater, it would be possible to judge more precisely, because with the Aa genotype, this man with a probability of 1/3 in a marriage with a blue-eyed woman should have had children with blue eyes. But there are only two children, so it is difficult to judge the genotype of the father.