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Agree with the answer by @A.Kennard. Here's a punnet square to clarify your answer further.


3

as far as simple punnet square is concerned your answer is correct.


2

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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