The Mystery Dna Analysis

The article that I found discusses how DNA evidence was used to convict a suspect after twenty years under investigation. The homicide case was recently closed on the rape and murder of Ophelia Preston, a 24 year-old female in Milwaukee County. Preston was deaf and mute and also suffered from a cocaine addiction, which led her to meeting Melvin Lee Jones.

When analyzing the documentary, “The Real CSI” Frontline Correspondent Lowell Bergman investigates three cases dealing with forensic evidence. First being the long practice of latent fingerprint analysis, bite marks, and the odder of death.

Each human being has something called DNA. DNA is described as genetics and an extremely long macromolecule that is the main component of chromosomes and is the material that transfers genetic characteristics in all life forms. DNA constructs of two nucleotide strands coiled around each other in a ladder like arrangement with the sidepieces composed of alternating phosphate and deoxyribose units and the rungs composed of the purine and pyrimidine bases adenine, guanine, cytosine, and thymine. Each chromosome consist of one continuous thread-like molecule of DNA coiled tightly around proteins and contains a portion of the 6,400,000,000 basepairs that make up your DNA.

In the case in which the man that was walking early in the morning and found a leg in the dumpster. It would of been extremely difficult for the FBI if they wouldn't of had the DNA Index System. By using this system in which federal, state, and local crime scene Labratories are allowed to electronically exchange and compare DNA profiles. The FBI was able to take things like scars and past surgeries that were done to the leg, and compare those things to profiles that had been kept in a hospital. This made it to where the police and the FBI could narrow the possible victims down to persons that had that type of knee surgery. The FBI were able to find a match from the hospital because the hospital was required to keep DNA samples for a minimum

They had obtained blood samples from Karen's Mother, Sisters, Children, and Ex Husband. They compared the known sample found on the carpet in the bedroom to Karen's relatives. The key to this test was seeing if half of the DNA matched the known sample to Karen's family. When it came back that it did match, they knew it was Karen who was murdered in the bedroom.

When they arrived, Katie opened the door immediately. They showed her the same picture of the gun they showed to John and asked the same question. Katie had no problem going to the safe in the closet leading off the master bedroom where the gun was always kept. They got to the safe, and the gun was lying on the floor right in front of the safe.

Tyler and Sally were in their neighborhood park when Markus Watson ran up to them say. “Sam Cronk and Jim Davis are dead, one was stabbed and the other we believe was forced or volunteered to drink a vial of poison. The weird part is that Sam Cronk had his fingerprints on both of the items used to kill them.”

Indeed DNA profiling has rapidly transform the field of forensics. DNA profiling is the scientific analysis of evidence for crime scene investigation and other legal proceedings. DNA profiling is mostly used by forensic scientists and crime lab technicians. To identify criminals and victims using trace evidence like hair or skin samples. To produce a DNA profile, scientists compare sequences in the genome that vary from person to person. The typical steps in DNA profiling are DNA samples are isolated from the crime scene, suspect, victims, or other evidence. The next selected sequences from each DNA sample are amplified (copied many times) to produce a large sample of DNA fragments. Finally the amplified DNA regions are compared using a gel. All together, these steps provide data about which samples are from the same individual and which sample is unique.

Sayahg (2010) states there were fourteen sets of prints not identified to anyone believed involved in the case and only one set of prints on a glass found in the kitchen belonged to Knox. Extensive DNA analysis was conducted by forensic expert Patrizia Stefanoni, Burleigh (2011) explains. Nike shoeprints were found to belong to Guede. DNA belonging to Guede was also found on Kercher's handbag, sweatshirt, and Touch DNA was found inside Kercher's vagina (Burleigh, 2011). A bloody handprint on Kercher's pillow also belonged to Guede (Sayahg, 2010). Knox's DNA appeared in the sink of the shared bathroom and Stefanoni also identified traces of Knox's DNA and minute traces of Solleccito's DNA on the broken clasp of Kercher's bra that Waterbury (2011)

When the couple left the restaurant, the investigators took the drinking cups from where they were eating to obtain DNA traces. The Analysists and investigators could match the DNA results to the DNA that was collected from the victims, but they could not rule out which O’Leary was responsible because the DNA only showed that it could have been O’Leary or his brother who committed the rapes, or that both siblings could had been responsible.

Former attorney General Janet Reno described our system of justice as a search for the truth.(1) Increasingly, the forensic use of DNA technology is an important ally in that search. DNA fingerprinting, better known in the scientific realm as DNA profiling, has given police and the courts a means of identifying the perpetrators of rapes and murders with a very high degree of confidence. However, nine years after its introduction, forensic DNA typing is still used only selectively. This is due to a variety of factors, including the unavailability of forensic typing to local prosecutors, the time required to perform the typing, and the costs of the tests if private laboratories are utilized. Formerly

The process of determining the validity of the three unknown specimens as new primate species is to generate a phylogenetic tree to represent the evolutionary relationships among the three unknown Rwanda species and other closely related species. These closely related species were taken from the diverse range of sequences given of eight other known primates using 12S ribosomal RNA.

Evidence 3: DNA profiling is less intrusive. The best way of retrieving a DNA sample is by using either blood, saliva, or hair. For example, if you happen to be in a situation where your town is taking DNA samples to help solve a crime, that would be the best way to go. This way you are helping but also giving less information for the better.

DNA forensics is a division of forensic science that focuses on the use of genetic material in criminal investigation to answer questions pertaining to legal situations, including criminal and civil cases. Through DNA testing, law enforcement officers are able to identify human remains or the individual responsible for a crime. DNA testing is a highly advanced scientific process that involves replicating the human DNA sequence to create a genetic map of an individual. Because of its reliability, DNA testing has become a significant factor in criminal cases. However, it has also been identified as having the potential to violate privacy and constitutional rights. The DNA identification process consists of five stages. These five stages

What is DNA? Is it these winding strands that look like ladders or is it what gives a person blonde hair and blue eyes? Actually, DNA is both of these things. DNA is a person’s genetic makeup–their hereditary blueprint passed on by their parents. It is a part of almost every cell in the human body. In each cell, a person’s DNA is the same; it stays the same throughout their lifetime. DNA is found in skin tissue, sweat, bone, the root and shaft of hair, earwax, mucus, urine, semen, and vaginal or rectal cells. The DNA found in a person’s saliva is the same as the DNA found in their blood. Parts of the DNA determine our physical characteristics, such as eye and hair color, height, and bone structure, but the