Question

What is correct for blood group 'O' :

• A. No antigens but both a and b antibodies are present
• B. A Antigen and b antibody
• C. Antigen and Antibody both absent
• D. A and B antigens and a,b antibodies

Answer 1

The correct option is A No antigens but both a and b antibodies are present

There are 4 main blood groups A, B, AB and O. Your ABO blood type is based on the presence or absence of the A and B antigens on your red blood cells.
A person who has blood group O will have no antigens, but both antibodies a and b are present against the blood groups A and B.
A person who has A blood group will have A antigens and b antibodies
A person who has B blood group will have B antigens and a antibodies.
A person who has AB blood group will have only A and B antigens and no antibodies