Q155 / 197 · NEET 2009 (Mains) · Zoology

The most popularly known blood grouping is the $\mathrm{ABO}$ grouping. It is named $\mathrm{ABO}$ and not $\mathrm{ABC}$, because "O" in it refers to having :

Correct answer
A
No antigens A and B on RBCs
B
Other antigens besides A and B on RBCs
C
Overdominance of this type on the genes for $A$ and $B$ types
D
One antibody only-either anti-A and anti-B on the RBCs

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

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