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Question
Can a child have blood group O if his parents have blood group ‘A’ and ‘B’. Explain.
Solution 1
If parents are heterozygous then child can have O blood group but if parents are homozygous then child cannot have O blood group.
Solution 2
Yes, a child with blood groups A and B can have blood group O.
If one parent's genotype is IAIo and the other parent's genotype is 1B 1o, then gametes from the parents can have either of the genotypes, i.e. IA, 1B or Io.
If fertilisation occurs only between gametes with Io, the child's genotype will be IoIo, and the child will have blood group O.
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