AIIMS2011ZoologyBody Fluids and Circulation
Assertion : Blood group ' O ' have anti-A & antiB antibodies. Reason : It does not have any antigens.
Options
- AIf both assertion and reason are true and reason is the correct explanation of assertion
- BIf both assertion and reason are true but reason is not the correct explanation of assertion
- CIf assertion is true but reason is false
- DIf both assertion and reason are false.
Correct answer
B. If both assertion and reason are true but reason is not the correct explanation of assertion
Step-by-step solution
ABO blood groups are determined by the gene I (isoagglutinin). There are three alleles, I^A, I^B and I^O of this gene. Proteins produced by the I^A and I^B 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 against 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 A B blood group have both antigen A and antigen B on their RBCs, and no