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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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riyadamin riyadamin
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11 years ago
A man with brown eyes marries a woman with blue eyes and they have children. What are the phenotypes and genotypes of their children?
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#1
11 years ago
The simple answer is that he has genotype BB and she has genotype bb, so every child has genotype Bb and brown eyes. Slightly more complicated, since B (brown) is dominant over b (blue), he could have genotype Bb. She still has genotype bb, but that means there is a 1 in 4 chance of a child having blue eye (bb).

The realities of eye color are slightly more complicated and it's not determined by a single gene and brown is not completely dominant. So their children could have virtually any eye color. They could have pure blue eyes, gray, green, hazel, or light brown. The would not have dark brown eyes because we know that they have to get genes for blue from mom. In much the same way, two parents with green eyes (which is caused by incomplete dominance) may also have children with almost any eye color.
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riverviewguitriverviewguit
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11 years ago
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