ETX 20 Lecture Notes - Lecture 21: Combined Dna Index System, Trace Evidence, Repeat Unit
1 Jul 2016
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Document Summary
Used to match up samples of dna evidence to a known sample. Polymorphic = many forms of that particular dna sequence. Marker = any detectable difference among individuals. Current methods use 13-15 polymorphic sites in the human genome -- codis markers. Profiles from crime scenes and suspects can be compared across states. Considered to be a test of identity. No two humans have the same dna profile except identical twins. Forensic scientists would look at different blood types. Lots of good quality sample was needed bc the test was not very sensitive. Good for exclusion but not for inclusion. Colin pitchfork: first person convicted based on dna fingerprinting . Investigators wanted to use this new technique but they didn"t know how, so they had to ask for a dna sample from every person living in the small village in england. A woman later came forward and said that pitchfork had asked someone else submit a dna sample for him.
