Question

Red blood cells that do not contain A antigen but have Rh antigen on their surfaces are normally found in the person with blood type

• A. A negative or B positive
• B. B positive or O positive
• C. O negative or B positive
• D. AB positive or A positive

Answer 1

The correct option is B B positive or O positive

ABO blood grouping is based on the presence or absence of two surface antigens A and B (chemicals that can induce immune response). For example, blood group A has antigen A, blood group B has antigen B, blood group AB has both antigen A and B on the surface of RBCs (red blood cells). But blood group O has no antigen on the surface of RBCs.

In addition to the ABO blood grouping system, the other prominent one is the Rh blood group system. About 80% of the population contains the third antigen on the surface of their red blood cells known as Rh factor or Rh antigen. This decides whether the blood group is positive or negative. If the Rh factor is present, an individual is rhesus positive (Rh+ve); if an Rh factor is absent, the individual is rhesus negative (Rh-ve).

Red blood cells that do not contain A antigens but have Rh antigens on their surfaces may or may not have B antigen. Hence, the blood type can be either B positive or O positive.