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Human Anatomy

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Unit 7: DNA By: Jasmine TInsley

What is DNA?



Graph of Different Cases Solved Using DNA


Where Do We Find DNA?

DNA Fingerprinting

What is DNA FIngerprinting?

DNA stands for Deoxyribonucleic acid and it is a molecule that carries all the genetic instructions used in the development and functioning of all living organisms, possibly viruses as well. DNA is made of a nitrogen bases—either guanine, adenine, thymine, or cytosine—as guanine.The nucleotides are joined together by alternating sugars and salts creating the backbone.

Since every person has unique DNA, the discovery of particular DNA evidence at a crime scene can help law enforcement determine who, or who wasn't, involved in a crime. DNA fingerprinting is highly accurate as long as the evidence isn't contaminated. Many of the DNA samples go into the Combined DNA Index System (CODIS) that can be used to identify possible suspects by matching DNA profiles. This database can help forensic crime laboratories at the local, state and federal levels work together to identify criminals and solve crimes.

Most commonly, the acronym BS BURST is used to explain how DNA is found. Here is the list as follows:B: BloodS: SemenB: BoneU: UrineR: Root of HairS: SalivaT: Tooth


How is DNA Used In Crime Scene Investigations?

Dna is Extracted in 3 steps:1. Breaking Down Membrane:soap is used to break membrane and get closer to DNA2. Breaking Down Proteins: salt is used to break proteins to reduce DNA3. Isolating DNA: alcohol is added to make DNA float to the top

DNA fingerprinting is a test to identify and evaluate DNA in a person's cells. It is called a "fingerprint" because no two people would have exactly the same DNA information. The test is used to determine whether a family relationship exists between two people, to identify organisms causing a disease, and to solve crimes.


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