In humans, brown eyes (A) dominate blue eyes (a). One family had four children: two brown-eyed and two blue-eyed.

In humans, brown eyes (A) dominate blue eyes (a). One family had four children: two brown-eyed and two blue-eyed. Their mother was blue-eyed. What color were their father’s eyes, what was the father’s genotype? Indicate the phenotype (eye color) of the father, the genotype of the father and mother.

Since brown-eyed children were born, despite the fact that the mother is blue-eyed, then the father is brown-eyed and has one allele A, but he had blue-eyed children, which means the second allele of the father is a.
Answer: mother – aa, father – genotype – Aa, father – phenotype (eye color) – brown.