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Question

The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC, because “O” in it refers to having


A

One antibody only ­either anti-­A or anti­-B on the RBCs

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B

Overdominance of this type on the genes for A and B types

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C

Other antigens besides A and B on RBCs

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D

No antigens A and B on RBCs

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Solution

The correct option is D

No antigens A and B on RBCs


The correct answer is D:

The explanation for the correct answer:

  1. In Humans the blood group is controlled by gene I. Depending on the type of I allele, there are present specific sugar polymers or sugar antigens on the surface of RBCs.
  2. When in any human there is no specific type of sugar polymer on the surface of RBC then the blood group of that human may be identified as the O blood group.
  3. Hence the correct answer is Option D.

The explanation for the incorrect answer:

Option A: In the O blood group, there are present both anti-A and anti-B antibodies not one alone and hence this is incorrect.

Option B: Human Blood Group does not show Overdominance rather it is known as an example of Codominance.

Option C: In Humans, there are only two types of antibodies, not any other type and hence this option is incorrect.

Final answer: The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC, because “O” in it refers to having No antigens A and B on RBCs.


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