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Dna: The Doble Helix Essay

1291 words - 6 pages

INTRODUCTION
The essential component of life can be acknowledged and is made up of a nucleic acid known as DNA. DNA is the abbreviated form for the word deoxyribonucleic acid and it is the “carrier of genetic information” (McMurry, Ballantine, Hoeger, & Peterson, 1992, pg. 775). DNA contains the genetic instructions that are needed for an organism to develop, survive, and replicate, as it plays a crucial role in living systems that makes each species unique and distinctive. The multifaceted material is stored in every cell of every living organisms and it contains information about our nature, appearance, performance, etc. With the instructions that it contains, DNA is passed from the adult ...view middle of the document...

The steps on the ladder are the stored information in DNA that are made up of bases and they are, (A) Adenine, (G) Guanine, (T) Thymine, and (C) Cytosine. These bases are joined together by a sugar-phosphate backbone known as base pairs, as adenine pairs up with thymine and cytosine with guanine.

DNA FINGERPRINTING How is it used in crime scene investigation? Discuss dna fingerprinting. How accurate is this tecnhgiue? For the past decade, DNA has been a great advantage in crime scene investigation. Not only can DNA identify criminals’ in a crime scene investigation, but it can also exonerate suspects who were wrongly convicted or accused of a crime. DNA fingerprinting is a technique for determining the probability that biological information originated from a specific group or individual. In other words, it is commonly used to determine whether a lineage relationship amongst two people exits, as well as solving crimes and detecting genetic syndromes. For the most part, DNA fingerprinting is 99.99% accurate. Research shows that “DNA fingerprinting is more accurate than traditional fingerprints, dental records, blood type, or ID tags” (Healthwise 1995). Given that, a forensic DNA testing is vastly accurate, and paternity DNA testing is typically 99% accurate. Due to modern technology and to certify no wrong data, most of the DNA tests are carried out at least twice. By doing this, it ensures the credibility of all tests. Inaccuracy of data is uncommon, but it is crucial to note that the DNA testing could be caused by samples being mixed up or information falsely inputted. DNA fingerprinting has been introduced as an innovative and effective method of solving crimes and cold cases, which is one of the many reasons why this technique has been a great advantage in crime scene investigation.

COLD CASES Discuss some recent court case where dna has either upheld or overturned a court decision? Can dna fingerprinting be used to re-investigate old case? Give some examples.
DNA has played a major role in courtrooms, whether a case is involved in a murder, rape, or any sort of crime, DNA can be used to help overturn a court decision. In such occasions, DNA has been expended to re-open and re-investigate old cases where the defendant was found culpable. Often times, when the police do not have sufficient evidence to bring a suspect to a court trial, that particular case can indefinitely be put aside. However, with the advent of DNA evidence, that case can also be open again. This is known as a cold case, where the prosecutor is able to re-open cases they assumed were once deceased.

RECENT COURT CASES
Many may have heard on the news about an All-American girl named Amanda Knox through the Meredith Kercher murder case that happened on November 1st of 2007....

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