A couple, one with blood group AB and the other with blood group O, want to know the possible blood groups of their child. Determine the possible genotypes and blood groups.

The mother has blood group AB, so her genotype is $I^A I^B$.
The father has blood group O, so his genotype is $I^O I^O$.

The mother can pass on an $I^A$ or an $I^B$ allele.
The father can pass on an $I^O$ allele.

From the Punnett square, the possible genotypes for the child are $I^A I^O$ and $I^B I^O$.

• Genotype $I^A I^O$ results in blood group A.
• Genotype $I^B I^O$ results in blood group B.

The possible genotypes are $I^A I^O$ and $I^B I^O$.
The possible blood groups are A and B.

You should draw a ring around the following:
Genotypes: $\boxed{I^A I^O}$, $\boxed{I^B I^O}$
Blood groups: $\boxed{A}$, $\boxed{B}$