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Question

A brown-eyed couple has a blue-eyed child. The trait of brown eye (B) is dominant over that of blue-eyed (b). What is the genotype of the couple?

A
Bb × Bb
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B
BB × BB
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C
BB × Bb
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D
BB × bb
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Solution

The correct option is D Bb × Bb
  • B is the dominant gene for the brown colored eye. So, for the progeny to be blue-eyes the recessive allele needs to be inherited from both the parents. This means, the brown-eyed parents need to be heterozygous.
  • The genotype of the couple is Bb x Bb because only this combination can give 25% probability of bb genotype in progeny which accounts for blue eyes.
So, the correct answer is 'A'.

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