Question Video: Identifying the Incorrect Blood Group from a List | Nagwa Question Video: Identifying the Incorrect Blood Group from a List | Nagwa

Question Video: Identifying the Incorrect Blood Group from a List Biology • First Year of Secondary School

Which of the following is not a blood type found in humans? [A] B [B] A [C] AO [D] AB [E] O

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Video Transcript

Which of the following is not a blood type found in humans? (A) B, (B) A, (C) AO, (D) AB, or (E) O.

Blood groups, or blood types, is a trait found in humans, where the blood group genes determine the antigens on the surface of an individual’s red blood cells. Antigens are substances such as proteins that are present on the surface of many cells, not just red blood cells, that let your immune system recognize your cells as your own.

If foreign antigens enter the body, for example, those found on the cell surface of pathogens like bacteria, or red blood cells from another person with certain different blood groups, they can trigger an immune response. This is why it’s important that the correct blood group is given in a blood transfusion. Type A, B, or neither A nor B antigens can be present on red blood cells.

There are three types of allele responsible for determining the presence of these antigens: I A for the A antigen, I B for the B antigen, and I O when the red blood cells have neither antigen present. If a person has the genotype I A I A or I A I O, they will have A antigens which correspond to blood group A. If a person has the genotype I B I B or I B I O, they will have B antigens which correspond to blood group B. If they have the genotype I A I B, they will have both A and B antigens corresponding to blood group AB. If they have the genotype I O I O, they will have neither antigen so have blood group O.

Looking at the information we have just learned, we can see that the possible blood groups would be A, B, AB, and O. As the question asks us to determine which answer is not a blood group in humans, none of these options can be correct. This means the correct answer to this question is (C). The option which is not a blood type found in humans is AO.

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