Question

if a brown-eyed man marries a blue-eyed woman and they have ten children, all brown-eyed, can you be certain that the man is homozygous? if the eleventh child has brown eyes, what will that show about the father's genotype?

Answer 1

No, you cannot be certain that the man is homozygous, as his genotype could also be heterozygous (Bb). If the eleventh child has brown eyes, this will indicate that the father is either homozygous (BB) or heterozygous (Bb). In this case, it is not possible to determine his genotype with certainty.