Question

In the ABO system of blood groups if both antigens are present but no antibody, the blood group of the individual would be

• A. O
• B. AB
• C. A
• D. B

Answer 1

The Correct Option is B

To understand the answer to this question, we must explore the basics of the ABO blood group system, which is determined by the presence or absence of specific proteins called antigens on the surface of red blood cells, and antibodies present in the plasma.

1. ABO Blood Group System:
   • The ABO blood group system classifies blood into four main groups based on the presence of antigens, which are A and B.
   • Individuals may produce antibodies against antigens they do not possess.
2. Characteristics of Each Blood Type:
   • Blood Group A: Has A antigen on the surface of the red cells and anti-B antibody in the plasma.
   • Blood Group B: Has B antigen on the surface of the red cells and anti-A antibody in the plasma.
   • Blood Group AB: Has both A and B antigens on the surface of the red cells and no anti-A or anti-B antibodies in the plasma.
   • Blood Group O: Has neither A nor B antigen on the surface of the red cells but has both anti-A and anti-B antibodies in the plasma.
3. Solution of the Given Question:
   • The question states that both antigens are present but no antibodies are present in the plasma.
   • This scenario matches the description of Blood Group AB, where both A and B antigens are present, and there are no antibodies against these antigens.

Conclusion: Based on the above reasoning, the correct answer is that the individual's blood group is AB.