The most well-known blood grouping is the $ABO$ group,named as $ABO$ and not $ABC$,because '$O$' in it refers to having:

  • A
    Dominance of genes over $A$ and $B$ types.
  • B
    Only one antibody or antigen $- A$ or antigen $- B$ on the red blood cells.
  • C
    No antigens $A$ or $B$ on the red blood cells.
  • D
    Other antigens on the red blood cells in addition to $A$ and $B$.

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