Define the term antigen.
Give two examples of places where non-self antigens might occur inside an organism.
One well-known example of antigens in humans is the ABO system of blood typing. Table 1 below contains some information about the antigens involved in ABO blood types.
Table 1
Blood group |
Antigens present on the surface of red blood cells |
Could receive a blood transfusion from blood group(s): |
A |
Type A |
A or O |
B |
Type B |
1 |
AB |
Types A and B |
2 |
O |
None |
O |
Fill in the gaps marked 1 and 2 in Table 1.
Use the information in Table 1 to explain the blood transfusion options available to a person with type O blood.
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