Blue eye colour in human is recessive to brown eye colour. The expected children of a blue-eyed woman and a brown-eyed man who had a blue-eyed mother is likely to be in the ratio of:

All blue-eyed

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Three blue-eyed and one brown-eyed

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All brown-eyed

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One blue-eyed and one brown-eyed

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Solution

The correct option is D
One blue-eyed and one brown-eyed

The recessive character is expressed only in homozygous condition. Thus, blue-eyed woman will have 'bb' genotype, while brown-eyed man may have 'BB' or 'Bb' genotype. But the man had a blue-eyed mother, so, he will have 'Bb' genotype. It can be explained as follows:

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