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Blue eye colour is recessive to brown eye colour. A brown eyed man whose mother was blue eyed marries a blue-eyed woman. The children shall be

1. both blue eyed and brown eyed 1 : 1
2. all brown eyed
3. all blue eyed
4. blue eyed and brown eyed 3 : 1

Correct answer: both blue eyed and brown eyed 1 : 1

Solution

A blue-eyed person must be homozygous recessive, so the woman is bb. The brown-eyed man has a blue-eyed mother, so he must be heterozygous Bb; crossing Bb × bb gives half brown-eyed and half blue-eyed children.

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