4. A brown-eyed man marries a blue-eyed woman and they have eight children, all

Question

4.
A brown-eyed man marries a blue-eyed woman and they have eight children, all with brown eyes. Can you be sure whether the man is homozygous or heterozygous for eye color?
A) Yes. In order to produce that many children he would have to be homozygous for brown eyes.
B) No. Eight children is not enough to determine homozygosity.
5.
From the previous question, let's consider an additional child. If the ninth child has blue eyes, will that settle the question?
A) Yes. If the ninth child has blue eyes this indicates that the father carries a recessive allele for eye color (Bb).
B) No. This is still not a statistically large enough number to determine homozygosity.

Explanation / Answer

A) Yes. In order to produce that many children he would have to be homozygous for brown eyes.

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