Questions 1:00 a.m., someone breaks a window in the back of a store and robs the
ID: 3522790 • Letter: Q
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Questions 1:00 a.m., someone breaks a window in the back of a store and robs the safe. On the way out, the thief is cut on a piece of broken glass. A forensic team collects and tests a sample of blood left behind by the thief. It is O-. The police bring in a suspect with a cut forearm who was arrested just three blocks of the from the store. The person resembles someone seen leaving the store at the time robbery. A sample of the suspect's blood is taken and tested for blood type. Once the suspect's blood is mixed with anti-A serum, it is immediately clear that the suspect is not the person who was cut on the broken glass in the store. How did the test indicate that fact? Suppose the same suspect's blood does not agglutinate when tested with anti-A or anti-B, but does agglutinate when tested with anti-Rh. Would this connect the suspect with the crime scene? Explairn your answer. 2. 2015 Caralina Biological Supply Companytrinted inExplanation / Answer
1. As clumping is seen in the test so the person inferred that it's not O-.
In O- blood group there will be no clumping in Anti-A, Anti-B, and Anti-D.
2. No, the suspect is not a person as in O- it should not agglutinate in any case.
The person’s blood type is A if agglutination occurred with the Anti-A test serum, similarly, the blood type is B if agglutination occurred with the Anti-B test serum. The blood type is AB if agglutination occurred with both the test serums, O if no agglutination occurred in either case.
The blood type of a person can be determined in a few minutes with this test. Similarly, Rh typing is done by mixing the blood sample with an anti-Rh serum. If the blood cells clump together in response to the anti-Rh serum, it indicates that the blood is Rh-positive. If no clumping occurs, the blood is determined to be Rh-negative.
3. Tom will have antibodies B.
Jane's blood- none
4. she should attempt to extract antigen from the cells, not the plasma. As antigens are present on the surface of RBC.
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