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4.Principles of Inheritance and Variation
medium
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-$i$ either anti-$a$ or anti-$b$ on the $RBCs$
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.
Standard 12
Biology