The most well-known blood grouping is the $ABO$ blood group. It is named $ABO$ instead of $ABC$ because what does the '$O$' represent?

  • A
    Neither $A$ nor $B$ antigens are present on the $RBCs$.
  • B
    Other antigens besides $A$ and $B$ are present on the $RBCs$.
  • C
    This type of overdominance is shown by $A$ and $B$ type genes.
  • D
    Only one of either anti-$A$ or anti-$B$ is present on the $RBCs$.

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