How DNA Evidence Works on fingerprint scanner by gyvwpsjkko


									?Fingerprint scanner
  Collecting and analyzing DNA fingerprint scanner evidence tops the list of the lab's
forensic toolkit, and its ubiquity in shows like "CSI" and "Cold Case" has increased
public awareness to the point that many jurors in real-world courtrooms expect to see
DNA evidence presented -- whether a case calls for it or not.
It's hard to believe that DNA fingerprint scanner evidence has come so far so fast. The
techniques that make it possible to identify a suspect using his or her unique genetic
blueprint have only been around since 1985. That's when Alec Jeffreys and his
colleagues in England first demonstrated the use of DNA in a criminal investigation.
Since then, DNA evidence has played a bigger and bigger role in many nations'
criminal justice systems. It has been used to prove that suspects were involved in
crimes and to free people who were wrongly convicted. And, in the United States, it
has been integral to several high-profile criminal cases.
At the heart of DNA fingerprint scanner evidence is the biological molecule itself,
which serves as an instruction manual and blueprint for everything in your body (see
How Cells Work for details). A DNA molecule is a long, twisting chain known as a
double helix. DNA looks pretty complex, but it's really made of only four nucleotides:
These nucleotides exist as base pairs that link together like the rungs in a ladder.
Adenine and thymine always bond together as a pair, and cytosine and guanine bond
together as a pair. While the majority of DNA doesn't differ from human to human,
some 3 million base pairs of DNA (about 0.10 percent of your entire genome) vary
from person to person.

In human cells, DNA is tightly wrapped into 23 pairs of chromosomes. One member
of each chromosomal pair comes from your mother, and the other comes from your
father. In other words, your DNA is a combination of your mother's and your father's
DNA. Unless you have an identical twin, your DNA is unique to you.
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