What’s the difference between blood in people that means we have different “types” and why are some incompatible?
In: Biology
Our blood contains antibodies and antigens. Different people have different antibodies/antigens. Antibodies attack antigens of the same type. Blood type O has no antigens and both A and B types of antibodies. Blood type A has antigen A and antibody B. Blood type B has antigen B and antibody A. Blood type AB has both antigens and neither antibodies. There is a final important antigen, known as D, which people are either positive for (they have it) or negative for (they don’t have it). This means that someone whose blood type is A+ has antigens A and D, as well as antibody B.
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