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11 September, 03:25

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?

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  1. 11 September, 05:52
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    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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