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Blood is grouped according to the kinds of antigens on the surface of red blood cells of an individual - VCE - SSCE Biology - Question 7 - 2003 - Paper 1
Question 7
Blood is grouped according to the kinds of antigens on the surface of red blood cells of an individual. One blood group in humans is the Rhesus blood group. With re... show full transcript
Worked Solution & Example Answer:Blood is grouped according to the kinds of antigens on the surface of red blood cells of an individual - VCE - SSCE Biology - Question 7 - 2003 - Paper 1
Step 1
If the answer stated 1 and 2
Answer
The man has made antibodies in response to foreign RBC and these continue to be made (structure 3).
Additionally, the antibodies the man has made have destroyed the Rhesus positive cells (structure 2).
Thus, the man continues to make his own cells (structure 1).
Step 2
If the answer stated 1, 2, and 3
Answer
The man has made antibodies in response to foreign RBC and these continue to be made (structure 3).
Although most Rhesus positive cells (structure 2) have been destroyed by antibodies, some still exist.
Moreover, the man continues to make his own cells (structure 1).
Step 3
Part c
Answer
The man should not be given Rhesus positive blood.
This is because he will still be making antibodies and have memory cells to the Rhesus factor five years later and if given Rhesus positive blood, an antibody reaction will occur immediately against the Rhesus on the donor red blood cells.
Furthermore, if monitored carefully, the man’s blood will still be reactive against future transfusions involving Rhesus positive blood.