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# 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.

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.

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).