Heterozygous, brown-eyed woman, married to a brown-eyed man, blue-eyed children, what is the man’s genotype?

Blue eye color is a recessive symptom. For it to manifest itself in the children of two brown-eyed people, they must be heterozygous. This means that the man’s genotype is Aa.

Scheme:

P: Aa x Aa;

G: A, a x A, a;

F1: AA, Aa, Aa, aa.

Children with the aa genotype will have blue eyes, the probability of having blue-eyed children in this couple is 25%.