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Willy Paredes
Dave Macseng
Connor Cole
Period

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The Innocence Project, a non profit organization dedicated to overturning wrongful convictions, uses STR analysis of archived samples from crime scenes to revisit old cases.
As of 2013 more than 300 innocent people have been released from prison as a result of STR analysis of old DNA evidence

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The probability that two people who are not identical twins have the same STR markers is exceptionally small

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The PCR step allows use of this method when the DNA is in poor condition or available in minute quantities. A tissue sample containing as few as 20 cells can be sufficient for PCR amplification.

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PCR and gel electrophoresis are used to amplify and then
identify STRs of different lengths

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Simple sequence DNA containing multiple tandemly repeated units of two to five nucleotides. Variations in STRs act as genetic markers in STR analysis, used to prepare genetic profiles

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STRs ‐ variations in the number of repeats of specific DNA sequences

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The FBI started applying DNA technology to forensics in 1988, using a method involving gel electrophoresis and nucleic acid hybridization to detect similarities and differences in DNA samples

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Genetic profiles are analyzed using genetic markers called
short tandem repeats (STRs)

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Earl Washington was convicted and sentenced to life in prison for a rape and murder trial of a young girl in 1982.  After 17 years in prison, STR analysis by forensic scientists associated with the Innocence Project, conclusively revealed that Earl was innocent.  He was let free immediately.

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An individual's unique set of genetic markers, detected most often today by PCR or previously, by electrophoresis and nucleic acid probes

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Genetic markers that vary in the population can be analyzed for a given person to determine that individuals unique set of genetic markers, or genetic profiles.

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DNA testing can identify individuals with a high degree of certainty, because the DNA sequence of every person is unique (except for identical twins).

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In Violent crimes, body fluids or small pieces of tissue may be left at the scene or on the clothes or other possessions of the victim or the assailant.