Question

Person with blood group AB is considered a universal recipient because it has
a.Both A and B antigens on RBC but no antibodies in the plasma.
b.Both A and B antigens in the plasma.
c.No antigen on RBC and no antibody in the plasma.
d.None of the above.

Answer 1

Human blood is not the same in all. People have different blood groups, depending upon the surface markers i.e., antigens and antibodies present the red blood cell.

Complete Answer:
Karl Landsteiner reported ABO blood groups for the first time in humans. These blood groups are determined by the gene I (isoagglutinin). There are three alleles, $I^A$, $I^B$, and $I^O$ of this gene. $I^A$ and $I^B$ are responsible for the formation of A antigen and B antigen respectively.
- Option a: Person with blood group AB has both A and B antigens on their RBCs but no antibodies in the plasma. It is considered a universal recipient because it does not have anti- A or anti- B antibodies and has both A and B antigen on the RBC. Since the blood group, AB has both antigens A and B, it can accept any blood containing any antigens A, B, both A, and B, or no antigens. Therefore, this is the correct option.

- Option b: A person with blood group AB has both A and B antigens in the plasma. Therefore, this is an incorrect option.

- Option c: Person with blood group AB has both A and B antigens on their RBCs but no antibodies in the plasma. Therefore, this is an incorrect option.

- Option d: Person with blood group AB has both A and B antigens on their RBCs but no antibodies in the plasma. Therefore, this is an incorrect option.

Thus, the correct option is A). Both A and B antigens on RBC but no antibodies in the plasma.

Note: Blood group O is said to be the most common worldwide, followed by group A. Group B is less common, and group AB is the least common.