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7 April, 12:40

Brown eyes is dominant to green eyes. Blue eyes is recessive to all eyes. Kate has green eyes (Her mother had brown eyes and her father had blue eyes). She marries Tom, who has brown eyes (his mother had blue eyes and his father had brown eyes). What are the odds that their child will have blue eyes?

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  1. 7 April, 13:56
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    There is a possibility that 1 in 4 progeny or 25% progeny is blue eyed.

    Explaination:

    Given in the question:

    Dominant eye color is brown

    Recessive to brown is green

    blue is recessive to both green and brown

    Kate = green eyes (mother brown eyed X father blue eyed)

    The gey gene has two alleles one of blue and other of green.

    Thus genotype of mother was Bbgreen

    genotype of father bb

    Bbgreen X bb

    Bb bb bgreeb bgreenb Kate's genotype

    genotype of kate = bgreenb

    Tom = brown eyes (mother blue eyed X father brown eyed)

    bb X BB

    Tom, genotype is Bb

    Cross between Tom and Kate

    Bb X bgreenb

    Punnet square shows that:

    B b

    bgreen Bbgreen bgreenb

    b Bb bb

    phenotype ratio

    2 brown: 1 green: 1 blue

    25% progeny is blue eyed.
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