Q. 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$-$either anti-a or anti–b on the RBCs
D) No antigens A and B on RBCs
Explanation
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.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.