Biology · PYQ NEET UG 2026

For a person with blood group 'O', which of the following is not a possible combination of parents' blood group genotypes?

1. Father : $I^A i$ and Mother : $I^B i$
2. Father : $I^A i$ and Mother : $I^A i$
3. Father : $I^B i$ and Mother : $I^B i$
4. Father : $I^A I^B$ and Mother : $I^A i$