2. Does the presence of someone\'s blood at a crime scene directly prove that th

Question

2. Does the presence of someone's blood at a crime scene directly prove that they are guilty of burglary? Defend your answer.

3. How would respond - The burglar denies having the blood type you identified, since he has proof that he had just received a large quantity blood transfusion with type O blood. Does a blood transfusion change your blood type, why or why not?

4. Why is it necessary to type the victim's blood?

Whodunit lab questions? Anti- Rho Serum CLUMP CLEAR CLUMP CLEAR CLUMP CLEAR Blood Source Anti-A Blood Type Observations Anti-B Serum CLEAR CLUMP CLUMP CLUMP CLEAR CLEAR Serum Crime Scene CLUMP Victim Suspect 1 us Sus Suspect 4 CLEAR CLUMP CLEAR CLUMP CLEAR B- AB+ B- ?- 1. Based on the blood typing results, who would you say committed the burglary? SUSPECT #3 WAS THE ONE WHO COMMITED THE BURGLARY

Explanation / Answer

2.ans: The presence of someones blood at a crime scene does prove that the party is guilty of burglary but adequate lab analysis must be followed to build up solid evidence in support of the conclusion.The blood analysis is a comparative analysis as it is a comparison of the victim's blood and the suspect's blood to blood found at the crime scene. So, for lab analysis, reference blood samples are required from the victim and suspect. A comparison must be made between the genetic markers in the victim s blood and the suspect's blood. The blood samples from the crime scene can then be analyzed for the genetic markers that are different in the suspect and victim. This holds true in conventional serology analysis. An ABO blood type determination of blood of the suspect to a known blood sample from a victim is to be performed for further analysis.Again, if blood groups of both the victim and the suspect are found to be similar,then the respective blood needs to be tested for variability in genetic marker phosphoglutamutase encoded by gene PGM-1.

3. Blood transfusion never changes the recipients blood type.When the donor blood is mixed into the recipients body with a transfusion, the donors DNA will be present for some days. But it cannot alter the blood group of the recipient since the red blood cells which are the primary component in transfusions, have neither nucleus nor DNA. Genetic information resides in the white blood cells. Our blood group is determined by the genes in the blood stem cells that reside in the bone marrow . Therefore blood group can never be changed.

4.ans.It is necessary to type the victims blood in order to draw comparative analysis with the blood of the suspect. Even in the case of a matched blood type, genetic marker analysis may help to find the suspect.

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