Sally has brown hair, which is a dominant trait and is represented by b. but she carries the recessive gene of blond hair represented by b. her husband tom has blond hair, which is a recessive trait and represented by bb. what percentage of their children will have blond hair?

50% of their children will have blond hair

Explanation:

Given ,

Allele for brown hair is represented by "B" and it is a dominant trait

While Allele for blond hair is represented by "b" and it is a recessive trait.

Genotype of Sally when it is given that she carries the recessive gene of blond hair  - Bb

Genotype of Sally's husband who has has blond hair, which is a recessive trait  - bb

Bb x bb

Bb, Bb, bb, bb

Out of four offspring two will have blonde color hair,

Thus, 50% of their children will have blond hair

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