Forensic DNA Fingerprinting Paper

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Forensic DNA fingerprinting can be used to analyze and match evidence in criminal cases. Restriction fragment length polymorphism (RFLP) is a technique that uses restriction enzymes to cut DNA at specific restriction sites, making fragments of the DNA. The band patterns these DNA fragments make are what we call the “DNA fingerprint” or “DNA profile”. In this study we used ENZ, an enzyme mixture of PstI and EcoRI, to digest or cut each DNA sample (from the crime scene and five suspects) into fragments and used gel electrophoresis to produce the DNA profile to determine if there is a match and which suspect is the match. The band pattern for each sample should be different unless the DNA sequence is the same; thus, eliminating suspects who do not match. Results showed that bands from S3 matched bands from CS, placing that suspect at the crime scene. All other suspects had unique band patterns, eliminating those …show more content…
Jeffreys saw that portions of DNA sequence vary among individuals. (Abullah, et al., 2014). Of the millions of nucleotides in our DNA, approximately 1 in 1000 is a site of variation, or polymorphism, in the population (Evett, Werrett, Gill, & Buckleton, 1989). With the exception of identical twins, each individuals’ DNA sequence is different, with a one in sixty-four billion chance for comparable DNA (comparable DNA has similarities but not identical) (Claridge, 2015). Cutting DNA with different sequences into fragments with an enzyme would produce unique band patterns in different DNA. These different band patterns make up the “fingerprint” of a person’s DNA and much like a fingerprint is unique to each individual. Digesting DNA with restriction enzymes, then separating the fragments with gel electrophoresis can be useful in criminal investigations, paternity testing, environmental sampling, and ancestry analysis, among many other uses (Brown, 2011, p.

Forensic Investigation History

A Brief History of Forensic Investigation. (n.d.). Retrieved January 31, 2018, from https://www.universalclass.com/articles/law/history-of-forensic-investigation.htm This source provides a brief history of Forensic Investigation and specifies how and when new forensics ways were discovered and the purpose of them. It states that in 1953 DNA was said to have unique structures, which was discovered by Watson and Crick. Then, the author goes into detail about how the restriction fragment length polymorphism…

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E. Coli Lab

labs was to isolate its DNA and analyze it through gel electrophoresis. Although I was unable to isolate any E. Coli DNA, my partner was able to; thus, any comparisons use her DNA. Furthermore, we ran our salmon sperm DNA on the gel as a visualizer for large amounts of DNA on the gel. Also, there was a pGLO plasmid as a positive control, and a ladder, to compare base pairs on the bands of DNA. On the gel, I can see three things of importance. First, the salmon sperm DNA shows up in bright, large…

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Does Genetic Technology Affects Society

in many ways including, solving crimes, resolving questions concerning relation in families, and stem cell research being done to help artificially grow new organs or body parts. There are many new ways that have been proven to effectively solve forensic and other sorts of crimes involving genetic information. Some specific examples of the techniques they use deviate from…

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Using Blood Evidence In Homicide Cases

author of “Forensic Science,” asserts how fingerprints help the investigation. He states “Although fingerprints have been used by crime investigators for more than a…

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CSI Episode Summary Of 'The Last Ride'

This paper will review the CSI episode sixteen “The Last Ride” from season fifteen and discuss discrepancies with standard scientific procedures. The two issues that will be discussed are the glass shard identification from the Packard and the DNA sample from the fingerprint. However, overall the methods and techniques used throughout the show were flawed, and the evidence seemed contrived with very little actual detective work being done to establish connections between the parties involved. Episode…

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History And Use Of Biometrics

-----------------3 Ancient finger prints-----------------------------------------------------------------------------4 II. Types of Biometrics A. Physiological--------------------------------------------------------------------------------4 DNA fingerprinting------------------------------------------------------------------------5 IRIS Recognition--------- -----------------------------------------------------------------5 B. Behavioral------------------------------------------------------------------------------------6…

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Wrongful Convictions

supporting organs leading to the suffering of the innocent through wrongful convictions. The increasing exoneration of wrongfully convicted individuals begs for an answer to the possible causes of such convictions. The proceeding sections of this paper will provide some answers to these questions. Reasons Why Innocent Individuals Get Convicted Some of the reasons for wrongful convictions are discussed as under; 1. Inaccuracy of Eyewitnesses Even though man’s fallibility is our established feature…

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Bombing Forensics Essay

Bombing Forensics CRJ311 Forensics 12 November 2012 Bombing Forensics Forensics has become a critical piece of not only our justice system, but as well as being utilized by our American Armed Forces. Every day we hear about soldier being killed by roadside bombs commonly known as Improvised Explosive Devices (IEDs). They have been the number one threat not only to our soldiers fighting in foreign wars in our history, but more presently and more widely known are events like the World…

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Personal Application of Criminology Paper

Personal Application of Criminology Paper CJA/314 Version 2 Criminology 02-27-2011 Personal Application of Criminology Paper When a person is in a situation like this, they may have a million things going through their heads, sometimes not and they’ll just proceed with calling the Police. With this situation one can handle it in a few ways, first call the police, then proceed with calling the boy’s parents, and tell my son what happened. If one can find out why this situation came about…

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Crime Scene Evidence Handling Essay

------------------------------------------------- Crime Scene Evidence Handling Melissa Factor CJ 498 Criminal Justice Capstone Professor Rachel Goguen 30JUN13 ------------------------------------------------- ------------------------------------------------- Abstract Crime scene yellow tape is a well-known sight. In order to preserve the integrity of the evidence of a crime scene, human contact should be avoided. Crime scenes are immediately sealed off, preventing the public from…

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