New answers tagged general-biology
Agree with the answer by @A.Kennard. Here's a punnet square to clarify your answer further.
as far as simple punnet square is concerned your answer is correct.
Your classmate is forgetting that the child will have to inherit one allele (A or a) from each parent. Suppose the dad is affected---so his genotype is Aa. He has a 50% chance of passing the A on to his kid. That means the kid has a 50% chance of being affected. If your classmate was right, then it would be possible for both the kid's alleles to come from ...
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