Forensic Evidence

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DNA Evidence and Analysis
According to legal dictionary, DNA evidence has become a major tool in the world of forensic science that has provided for the analysis of forensic evidence, biological material that makes up the genetic code of most living organisms. DNA analysis, also known as DNA profiling and typing, examines the biological material found in DNA as physical evidence such as blood, hair, semen, tissue, bones, teeth, or other bodily fluids that is found at a crime scene, and is essential to linking to or excluding someone from crime scene evidence (legal dictionary). McDonald & Lehman, (2012). Says in 1953, Rosalind Franklin, James Watson, Francis Crick discovered DNAs double helix structure consisting of two twisted strands of polymers held together by hydrogen bonds that form between the complementary base pairing of nucleotides: adenine, to thymine and cytosine to guanine. A discovery that led to questions about how DNA variability are differences in the arrangement of base pairs and is …show more content…

Differences that not only make individuals look different, but also give individuals a unique DNA pattern or profile and is the same in every cell throughout a person’s body except for twins (McDonald & Lehman, 2012). In 1985, Sir Alec Jeffreys a English scientist advanced DNA profiling (analysis) by developing (RFLP), a restriction fragment length polymorphism a technique used to determine variations of Tandon repeats patterns of two or more repeated nucleotides in DNA sequences (McDonald & Lehman, 2012). The resulting DNA fragments are repeated by electrophoresis producing a unique individual pattern. This process is said to be time consuming. DNA profiling was first used in the case of Colin Pitchfork, a United Kingdom resident who was convicted

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