Essay on Dn Dna And Dna

Essay on Dn Dna And Dna

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Almost every cell in our body contains deoxyribonucleic acid (DNA). DNA can be defined as “a molecule that encodes the genetic instructions used in the development and functioning of all known living organisms…” (University of Utah, 2014). In other words, DNA is a genetic material that contains the information of how cells work. DNA can be used to identify people because everyone has different DNA sequences and varying lengths of DNA. Every human cell contains 3 billion DNA base pairs. We share about 99.9% of our DNA, but the remaining 0.1% is unique. Identical twins are the exception, as they share 100% of their DNA. DNA is made up of A’s T’s G’s and C’s. We all have two sets of DNA which we get from our biological mother and father. When a crime is committed, the criminal sometimes leaves traces of their DNA behind which can be in the form of hair, skin, saliva, semen, and even blood. When DNA was first discovered and used as evidence from crime scenes, scientists would need a sample as big as a dime. With todays advances, scientists can get DNA from something as small as a cigarette butt using a technique called Polymerase Chain Reaction (PCR). PCR is a tool that focuses in on a segment of DNA and then copies it billions of times. PCR was discovered by Dr. Kary Mullis. “The copying process, known as polymerase chain reaction (PCR), uses an enzyme (polymerase) to replicate DNA regions in a test tube. By repeating the copying process, a small number of DNA molecules can be reliably increased up to billions within several hours.” (National Institute of Justice, 2012). PCR is also helpful as it can accurately analyze poor samples that may have one from dirty crime scenes, or that are just really old.
DNA is analyzed by following ...


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...eal case. If he had threatened her in the past, had previous convictions of violent crime, or showed violent behavior to her, then there is reason to believe he did it. Let us now pretend that he is in fact convicted of rape based solely off of the DNA and is in jail for several years. If new DNA evidence comes up that shows another person was the rapist, he should definitely be exonerated. As aforementioned, in some states, there is a limit of 6 months to bring new DNA evidence to court to exonerate someone of a crime. Whether it is 1 month, or 100 years after the conviction, a person who is wrongfully in jail should be taken out if they are not guilty. It seems like that 6 month rule should not exist in this country.
Although DNA is a very effective tool used in crime cases, it is very costly, and there are analysis delays that impact the criminal justice system.

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Essay on Dn Dna And Dna

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