.The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC, because "O" in it refers to having AIPMT - 2009

• A. Overdominance of this type on the genes for A and B types
• B. One antibody only - either anti - A or anti - B on the RBCs
• C. no antigens A and B on RBCs
• D. other antigens besides A and B on RBCs
• E. cessive