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

1. B
2. O
3. AB
4. A

Correct answer: AB

Solution

In the ABO system, type AB red blood cells have both A and B antigens on their surface. Because the body does not make anti-A or anti-B antibodies against its own antigens, AB is the blood group with both antigens and no antibodies.

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