A blue-eyed woman whose parents had brown eyes married a brown-eyed man whose mother was blue-eyed and whose father was brown-eyed. What children can appear in this family (in relation to this sign)? Write down all possible genotypes of all family members.
The eye color gene is inherited in a complete dominance pattern. A – brown eye color, and – blue.
The woman is blue-eyed, homozygous for the recessive trait (aa). Consequently, her parents were heterozygous (Aa).
The man is brown-eyed, but since his mother was homozygous for a recessive trait, his genotype contains a recessive gene (Aa). Genotypes of his parents: mother aa, father Aa or AA.
The likelihood of having children:
P: aa x Aa
G: a X A, a
F: Aa – 50% (brown eyes)
aa – 50% (blue eyes)
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