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A man of 'A' blood group marries a woman of 'AB' blood group. Which type of progeny would indicate that man is heterozygous ?
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B

From the above cross, it is clear that the occurence of B blood group progeny indicates that man is heterozygous for the allele \(A\). If the man is homozygous for the allele \(A\), the progeny will have either an \(A\) or \(A B\) type blood group.

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