The most popularly known blood grouping is the $ABO$ grouping. It is named $ABO$ and not $ABC$,because '$O$' in it refers to having

  • A
    Other antigens besides $A$ and $B$ on $RBCs$
  • B
    Over dominance of this type on the genes for $A$ and $B$ types
  • C
    One antibody only-either anti-$A$ or anti-$B$ on the $RBCs$
  • D
    No antigens $A$ and $B$ on $RBCs$

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