# The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC ,because "O" in it refers to having: Option 1) overdominance of this type on the genes for A and B types. Option 2) one antibody only - either anti- A or anti -B on the RBC; Option 3) no antigens A and B on $RBC_{S}$ Option 4) other antigens besides A and B on $RBC_{s}$

As we learnt in

ABO Grouping of BLOOD -

ABO grouping is based on the presence or absence of two surface antigens (chemicals that can induce immune response) on the RBCs namely A and B. Similarly, the plasma of different individuals contain two natural antibodies (proteins produced in response to antigens). The distribution of antigens and antibodies in the four groups of blood, A, B, AB and O

- wherein

Option 1)

overdominance of this type on the genes for A and B types.

Incorrect

Option 2)

one antibody only - either anti- A or anti -B on the RBC;

Incorrect

Option 3)

no antigens A and B on $RBC_{S}$

Correct

Option 4)

other antigens besides A and B on $RBC_{s}$

Incorrect

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