Q160 / 200 · NEET 2009 (Screening) · Zoology

The most popularly known blood grouping is the $\mathrm{ABO}$ grouping. It is named $\mathrm{ABO}$ and not $A B C$, 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
  • Correct answer
    D
    no antigens $A$ and $B$ on RBCs

Solution

Landsteiner divided human population into four groups based on the presence of antigens found in their RBCs. Each group represented a blood group. Thus, there are four types of blood groups A, B, AB and O. Blood group ' $O$ ' does not contain any antigen on RBCs, hence can be given to any person, that's why this blood group is called universal donor.

Hence, the correct answer is option: 'D'.

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