01 - Left at the Scene of the Crime: Intro to Forensic Science
Experimental Results and Analysis
AGAROSE GEL ELECTROPHORESIS
Lane
Tube
1 2 3 4
A B C D E
DNA Standard marker Crime scene PCR reaction Suspect 1 PCR reaction Suspect 2 PCR reaction
5 Suspect 3 PCR reaction The DNA standards in Lane 1 make it possible to measure the DNA bands obtained from the PCR reactions. The results of this analysis indicates an identical pattern in Lanes 2 and 4. This is strong evidence that the crime scene DNA and Suspect 2 match. In criminal investigations, several known variable regions in DNA are ana- lyzed to match crime scene and suspect DNAs.
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