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4 August, 08:34

Brown eyes is dominant to light eyes. Mr. O'Ryan has blue (light) eyes. Mrs. O'Ryan is heterozygous for brown eyes. What are the color possibilities of their son?

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  1. 4 August, 08:45
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    Mr. and Mrs. O'Ryan are likely to have children with brown or blue eyes, with a 50:50 chance.

    Explanation:

    According to the genotypes of the parents, a cross can be made and the probability of the offspring having blue or brown eyes can be determined.

    Genotypes:

    Mr. O'Ryan bb (homozygous recessive).

    Mrs. O'Ryan Bb (heterozygous).

    Bb X bb

    Alelles B b

    b Bb bb

    b Bb bb

    The result of the crossing is:

    Heterozygous Bb descendants with a brown-eyed phenotype (50%). Homozygous recessive descendants bb, with a blue-eyed phenotype (50%).

    Mr. and Mrs. O'Ryan have the possibility to have both brown - and blue-eyed offspring.
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