support for a dna data bank
A DNA Bank Is Good For All
Imagine that a convicted child molester is released from jail and
that he is now traveling around the country looking for work. One day
this criminal returns to his old ways and he attacks a young child whose
dead body is found in a deserted field the following day. The only trace
of evidence at the crime scene is a semen specimen on the boys clothes.
Now this specimen could be useful if the police tracked down, and arrested
the suspect, and then took a blood sample of his that matched the crime
scene specimen. But, since no other clues are found this criminal was
never arrested and for the next couple years he repeated this act many
more times. It is a shame that innocent children had to die because of
this sick man, and most people would agree criminals like this should be
stopped at any cost. Now just think what would have happened had their
been a DNA data bank that contained this man To understand why a DNA
data bank is necessary it is important to know exactly what DNA is.
Firstly, there are cells which makes up all organisms and inside these
cells are chromosomes. Chromosomes, which are made up of DNA, contain all
the hereditary information that an individual has. Now this DNA
(Deoxyribonucleic acid) which makes up these chromosomes simply contains
the blueprints of the organism. It is DNA which determines what, where,
and when to make a certain protein, and it basically is the storage center
for information in almost all creatures. This knowledge of DNA is
important because now it is possible to show the correlation between DNA
and forensic technology.
There are many reasons why DNA is such a useful tool for law
enforcement. One important feature of DNA, relates to the fact that all
individuals have unique DNA, is that each cell in an organism has
identical DNA. Whether it is found in in skin cells, hair cells, semen
cells, or blood cells the DNA found in one cell is identical to the DNA
found in all other cells in the body Another extremely crucial
characteristic of DNA is that everyone has their own unique DNA. Since
humans in general are basically alike in that we all have legs, arms,
hearts brain it is obvious that most DNA is identical. The key though to
identifying individuals through DNA is not through the strands of DNA that
have a known function, rather it is the DNA that has no known function.
Inside these strands of DNA with no known function, called Junk DNA, are
different repetitive DNA patterns which are unique from person to person.
This is why DNA can always, be traced back to one person (with the
exception of identical twins).
There are two tests for analyzing DNA for forensic use, Restriction
Fragment Length Polymorphism (RFLP), and Polymerase Chain Reaction (PCR).
The RFLP test consists of taking a sample of body tissue which contains
DNA. After locating the DNA thousands of different combinations of DNA
repeats called Variable Number of Tandem Repeats (VNTR) are examined.
These VNTR There are a great number of reasons to have a DNA data
bank, but first it is important to accurately describe the requirements
for this DNA data bank. Only convicted criminals would be entered into
the bank. Also, only Junk DNA would be kept as data, DNA that contains
no personal or hereditary information. One advantage to a data bank will
be the quick access to information. Prosecutors are going to be able to
match the DNA collected at a crime scene with DNA that has already been
collected in the bank and this will allow them to apply for a warrant
faster. Take the case of Jean Ann Broderick. In 1991 she was found
murdered and raped in her Minnesota apartment. There were no witnesses or
evidence that led to any one suspect. The only lead at the crime scene
was a semen stain on the victim. Minnesota at this time was one of the
few states that had and used a DNA data bank of convicted criminals, so
the Minnesota authorities checked their sample DNA with the DNA data bank
and found a match that linked the DNA with Martin Perez, a 37 year old
illegal alien. After Perez was identified by the DNA, he was also
identified by witnesses, who saw him at Jean Ann Broderick Another
advantage of having a DNA data bank is that it