Question

Human blood grouping is ABO instead of ABC because O in it refers to

• A. No antigen A or B on RBCs
• B. Other antigens besides A and B
• C. Overdominance of its gene over A and B
• D. One antibody only either anti-A or anti-B

Answer 1

The correct option is A No antigen A or B on RBCs

Human blood grouping is ABO instead of ABC, because, Individuals with type O blood do not produce ABO antigens. Therefore, their blood normally will not be rejected when it is given to others with different ABO types. As a result, type O people are universal donors for transfusions, but they can receive only type O blood themselves.

So, the correct option is ‘No antigen A or B on RBCs’.