So let's begin with blood type a. So if our male parent has the A blood and if the female has the a blood, they will mix. They will produce blood type A. Now, if the male has, let's say, the blood type a, and the female lacks either one of those trace, either one of those codes, what that means is we'll have IA and lowercase IO. And what that means is we'll still form form blood type a because the offspring will have the gene from the male parent that will create that protein antigen A. Now, the same thing is true for blood type B, IB.