Assume that the allele controlling brown eyes (B) is dominant over that controlling blue eyes (B) in human beings. (In actuality, eye color in humans is an example of polygene inheritance, which is much more complex than this
) A blue-eyed man marries a brown-eyed woman, and they have six children, all brown-eyed. What is the most likely genotype of the father? What is the most likely genotype of the mother? If a seventh child had blue eyes, what can you conclude about the parents' genotypes?
What will be an ideal response
The most likely genotype of the father is bb (homozygous recessive) for the trait. The most likely genotype for the mother is either Bb (heterozygous with both a dominant and a recessive gene) or BB (homozygous dominant) for the trait. If a seventh child had blue eyes, the mother's genotype would be Bb, and the father's genotype still would be bb.
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