And what that means is our immune system will not produce any antibodies against this antigen B, but now will produce antibodies against antigen A because it doesn't have any antigen A on that protein. So this is blood type A and this is blood type B. Blood type A contains antigen A and antibodies against antigen B, while blood type B contains our membrane bound antigen B and so contains antibodies against antigen A. Now the next question is how exactly do we pass down these blood groups from one individual to our offspring? So basically, each parent has the ability to donate a gene for that particular blood group that they actually have. So let's suppose this is the male parent chromosome, this is the female parent chromosome and this is chromosome nine for each case because this is the alley, the gene section that codes for a particular type of blood group.