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(C) The genotype of a man with blood group $A$ can be either homozygous $(I^A I^A)$ or heterozygous $(I^A i)$.The genotype of a woman with blood group

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$B$

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(C) The genotype of a man with blood group $A$ can be either homozygous $(I^A I^A)$ or heterozygous $(I^A i)$.The genotype of a woman with blood group $AB$ is $I^A I^B$.If the man is homozygous $(I^A I^A)$,the possible offspring genotypes are $I^A I^A$ (blood group $A$) and $I^A I^B$ (blood group $AB$).If the man is heterozygous $(I^A i)$,the possible offspring genotypes are $I^A I^A$ (blood group $A$),$I^A I^B$ (blood group $AB$),$I^A i$ (blood group $A$),and $I^B i$ (blood group $B$).Therefore,the presence of an offspring with blood group $B$ $(I^B i)$ confirms that the father must carry the recessive allele $i$,meaning he is heterozygous $(I^A i)$.

If a man with blood group $A$ marries a woman with blood group $AB$,which of the following offspring would indicate that the man is heterozygous for blood group $A$?

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