Correct Answer: B
Explanation:
): ABO blood groups are determined by the gene I (isoagglutinin). There are three alleles, 1A, 1B and 1° of this gene. Proteins produced by the IA and IB alleles are called A antigen and B antigen. People with blood group A have the A antigen on the surface of their RBCs, and antibodies to antigen B in their plasma.
Persons with blood group B have B antigen on their RBCs, and antibodies against A antigen in their plasma, individuals with AB blood group have both antigen A and antigen B on their RBCs, and no antibodies for either of the antigens in their plasma. Type O individuals are without A and B antigens on their RBCs, but have antibodies for both these antigens in their plasma.