In this inheritance pattern, more than two alleles are responsible for the expression of a trait. An example is the human blood type. There are four blood types: A, B, AB, and O. They represent the type of antigen present in the blood. An antigen is any substance that causes the immune system to produce antibodies. Blood type determines what kind of blood a body will accept or reject. It’s important for people to know their blood type, especially during medical emergencies.
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