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12. A child has blood group O. If the father has blood group A and mother blood group B, work out the genotypes of the parents and the possible genotypes of the other offsprings.


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If the child has O blood group than it is evident that parents are heterozygous. Thus, the genotype of the father will be I^{A}i and that of the mother will be I^{B}i. The child having blood group O will have genotype ii. The other children may have genotypes I^{A}i (A blood group), I^{B}i (B blood group) and I^{A}I^{B} (AB blood group). 

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