Question

A brown-eyed man whose father was brown-eyed and whose mother was blue-eyed, married a blue-eyed woman whose father and mother were both brown-eyed. The couple has a blue-eyed son. If brown eyes are dominant over blue eyes, for which of the individuals do you know the genotypes for sure? What are they? What genotypes are possible for the others?

Answer 1

Answer:
it’s more likely due the brown alele is dominant.

But it depends on the genotype, because she can be a carrier of the blue gene. In the simplest models of eye color, there are two genes involed (this is a simplified model).

Gene 1 there are two possibilities brown or blue. The brown version of the gene 1 is dominant over the blue one. Dominant means is if a least 1 of your copies is brown. then you will have brown eyes.

Gene 2. there are two possibilities, green or blue. Green is dominant over blue,