A) 6
B) 8
C) 1
D) 4
Correct Answer: D
Solution :
Landsteiner categorised human population into four groups based on the presence of antigens found in their RBCs. Each group represents a blood group viz. A, B, AB and 0. The phenotype, genotype antigen and antibody of blood group ABO-| Phenotype | Genotype | Antigen | Antibody |
| A | \[{{\text{I}}^{\text{a}}}{{\text{I}}^{\text{0}}}\text{,}{{\text{I}}^{\text{a}}}{{\text{I}}^{\text{a}}}\] | A | B |
| B | \[{{\text{I}}^{\text{b}}}{{\text{I}}^{\text{0}}}\text{,}{{\text{I}}^{\text{b}}}{{\text{I}}^{\text{b}}}\] | B | A |
| AB | \[{{\text{I}}^{\text{a}}}{{\text{I}}^{\text{b}}}\] | A,B | None |
| O | \[{{\text{I}}^{0}}{{\text{I}}^{0}}\] | none | a,b |
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