Person with B antigen over the red blood cell shows B blood group phenotypes.
Before receiving a blood transfusion, a person must have a blood type test, as well as before becoming pregnant. Antigens found on the surface of red blood cells are used to sort human blood. To determine if two people are likely to be blood relatives, blood type tests may also be used. Blood group antigens (ABO) and the Rh antigen, which is either present (positive, +) or absent, are the two most significant antigens (negative, -). The ABO and Rh tests are thus the two most popular blood type assays.
Hence, blood group shows phenotype based on antigen over RBC.
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