You just have to separate the letter from the + or -. O
is the recessive
, so if you are O
, then your gene is OO. If you are A, you can be AA, AB, or AO. If you are B, you can be BB, or BO. If you are +, you can be ++, or +-. If you are -, you can only be --. Therefore O+, and O+ could only equal O+, or O- (that would be assuming you carry the recessive - trait). To get an A+ baby, you would have to have one parent that is A, and the same parent or the other parent would have to be +.