Answer:
Step-by-step explanation:
The child's blood type is O, the genotype will be OO
The mother's blood type is A, her genotype can be AA or AO
Thus, a cross between the mother AA and assuming the father OO will produce all AO
A cross between the mother being AO and assuming father with OO has a 50% chance of producing OO (O bloodtype)
A cross between the mother's AO and assuming a father heterozygous AO (A bloodtype) has a 25% chance of producing a child with OO blood type O
A cross between the mother if she is AA and assuming a father with AO will not produce a child with blodtype O
A cross between the mother being AO and assuming father with BO (blood type B) has a 25% chance of producing OO (bloodtype O)
Thus the possible bloodtype of the father can be
1. bloodtype A (AO) if mother is AO
2. bloodtype O (OO) if mother is AO
3. Bloodtype B (BO) if mother is AO