Group B individuals have which antibody in their serum?

Group B individuals have which antibody in their serum?

• A. Anti-A
• B. Anti-B
• C. Both
• D. Neither

Answer: (A)

Group B individuals have B antigens on their red blood cells, so their plasma contains antibodies against the A antigen that they do not possess. This anti-A antibody is what would be found in their serum. The antibody against B would be present in people who lack B antigen (types A or O), not in type B individuals. Type O would have both anti-A and anti-B, while type AB has neither. So anti-A is the antibody present in the serum of group B individuals.

Group B individuals have B antigens on their red blood cells, so their plasma contains antibodies against the A antigen that they do not possess. This anti-A antibody is what would be found in their serum. The antibody against B would be present in people who lack B antigen (types A or O), not in type B individuals. Type O would have both anti-A and anti-B, while type AB has neither. So anti-A is the antibody present in the serum of group B individuals.