Question

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. No antigens A and B on RBCs
• B. Other antigens besides A and B on RBCs
• C. Over dominance of ‘0’ on the genes for A and B types
• D. One antibody only, either anti-A or anti-B on RBCs

Answer 1

The correct option is A

No antigens A and B on RBCs

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. The blood group ‘O’ does not contain any antigen on RBCs and can be given to any person. Hence, this blood group is called a universal donor.