There are three different alleles A, B, O
These produce four different phenotypes A, B, AB, O
How blood type is determined in the ABO blood group system?
The test to select your blood group is called ABO typing. A blood sample is mixed with antibodies against type A and B blood. Then, the selection is checked to see whether or not the blood cells stick together. If blood cells stick together, it means the blood reacted with one of the antibodies.
Thus, is related to the ABO blood group system.
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