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Can a child have blood group O if his parents have blood group ‘A’ and ‘B’? Explain.

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Yes, it is possible for a child to have blood group O if the parents have blood group A and B. If genotypes of the parents are IAi and IBi, then gametes can have one of the genotype from i, IA or IB. The child’s genotype will be ii if fertilization of gametes occurs with i; hence the child will have blood group O.

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