Question

Which of the following is correct for blood group 'O'?

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

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.

$\bullet$ 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.
$\bullet$ A person who has A blood group will have A antigens and b antibodies
$\bullet$ A person who has B blood group will have B antigens and a antibodies.
$\bullet$ A person who has AB blood group will have only A and B antigens and no antibodies