CRJS478 IP3

Apr 24th, 2015
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As you study DNA, you find that every person's DNA is different from another's. Identical twins are the only people whose DNA is the same. Consider your parents and your siblings. Even though your brother and your sister have the same parents, it is unlikely that you look exactly like them unless you are identical twins. You may have common features, and you will all share common DNA among yourselves, but only identical twins will have the exact same DNA. DNA testing is used for many reasons such as the following: • Identify potential suspects whose DNA may match evidence left at crime scenes • Exonerate persons wrongly accused • Match organ donors Assignment Guidelines • Address the following in 4–5 pages: o In your first case, you have been asked to list and explain the steps that you would use to identify and analyze DNA from a person who has been in prison for 10 years. The results of your test may exonerate the person.  Once the physical evidence has been delivered to the forensics

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CRJS478-IP3NameClassDateProfessorDNA in Investigation DNA has become an important part of many criminal investigations as well as essential for identifying the unknown, determining paternity, and to exonerate the innocent serving time in prison. In the cold case investigation DNA evidence needing to be tested that is ten years old will have begun to degrade and may or may not be testable. When getting DNA from a person that has been in jail for ten years the forensic investigator can swab their mouth, extract hairs with the root, or draw blood. Anyone of these biological materials will elicit a DNA profile of the prison inmate. If it is believed the inmate has been falsely convicted the DNA profile that is generated will be matched to DNA left at the scene. Because evidence quickly degrades there may only a small amount to test. Biological evidence, which contains DNA, is a type of physical evidence (NIJ, 2012). Physical evidence at the crime scene may contain DNA pointing to the actual criminal responsible for committing the crime. Identifying DNA on the evidence begins with locating cells for DNA typing. The different sources of DNA that can be located at the crime scene include semen, blood, sweat, skin cells, hair, saliva, and blood. The first step is to isolate the DNA from the evidence sample. Next the DNA is measured to determine the quantity of DNA recovered. Small amounts of DNA will be copied using polymerase chain reaction

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