Answer:
AA, AO, AB, BB, BO, and OO, with AB being co-dominance.
Explanation:
The AB blood type is co-dominant since both the A and B alleles are expressed. Please note that sometimes textbooks and teachers prefer the more correct use of I^A ect. I'll put a picture below to show you.
Another note: There are only four phenotypes but technically 6 genotypes, the reason being that AO is expressed as A and BO is expressed as B.
Let me know if you have further questions.
