Question

How many possible blood antigen combinations are there?

Answer 1

there are two types of antigens in ABO human blood grouping system.

Explanation:

there are two antigens in ABO human blood grouping system:

• A
• B

These antigens form four types of blood groups:
- A only A antigen present
- B only B antigen present
- AB both A and B antigens present
- O neither A nor B antigen present

Each blood group may be either Rh positive or Rh negative, due to presence or absence of rhesus antigen.

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