Now as it turns out, the blood type is a codominant train, a codominant trait. And what that basically means is if one parent gives an antigen A gene while the other parent gives an antigen B gene, they will both be expressed on that red blood cells membrane. And what that means is if this is A and this is B, when they combine they will form the AB blood type group. And what that means is the red blood cells will have both of these antigens attached onto the membrane of the red blood cell. And this is what we call blood type AB. And because in this individual the red blood cell membrane contains both of these antigen types, our immune system will not produce antibodies against both of these types.