Parents with the genotypes ao and ab have a child. what are all the possible blood types of the child?
a - a, b
b - o, ab
c - a, ab, b
d - o, ab, a

Possible blood types of the child with parents whose genotypes are AO and AB are: C. A, AB, B

Possible genotypes for 4 blood types

Type O    - OO
Type A    -  AA, AO
Type B    -  BB, BO
Type AB  - AB

                   A                        O
A              AA                        AO

B              AB                      BO

Genotype AA and AO are under TYPE A
Genotype AB is under TYPE AB
Genotype BO is under TYPE B