Question

Blonde hair (represented as b) is a recessive trait. If Julie has blonde hair, which of...

Blonde hair (represented as b) is a recessive trait.

If Julie has blonde hair, which of the following could have been her parents' genotypes?

  • Bb, bb

  • BB, BB

  • BB, bb

  • Bb, BB

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Answer #1

Correct Answer is A.

Blonde is a recessive trait which means only bb genotype will show blonde hair phenotype and the person having Bb genotype is only a career but will not have a blonde hair.

So as per question Julia has blonde hair so she should have bb genotype. So her parent's genotype has to be in a way which will produce bb genotype after fusion of gametes.

As you see option A. Bb crossing with bb will produce 2 progenies having bb genotype, so two progenies will definitely have blonde hair .

But if you see other options none of them will produce bb progenies after crossing.

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