Dna Technology

Topics: DNA, Restriction fragment length polymorphism, Molecular biology Pages: 2 (292 words) Published: December 9, 2006

How is DNA technology used in law enforcement? There are many different ways it is used, but it is mostly used to solve crimes. Much

like deaths, rapes, or even big robberies. DNA is a way to identify a person by: blood, hair, skin, saliva etc... That is why when people are trying to

discover a murderer they are very careful when they are collecting evidence.That is why when something occurs, everything is blocked off, and

only investigators could pass into the area.While they are invetigating they are looking for any items that might have DNA on it from the killer.

Then they use DNA technologies to " discover" or trace the killer and to find who the victom is or was.

Restriction Fragment Length Polymorphism (RFLP) is a technique for analyzing the variable lengths of DNA fragments that result

from digesting a DNA sample with a special kind of enzyme.This enzyme is a restriction endonuclease which cuts DNA at a specific sequence

pattern known as a restriction endonuclease recognition site. The presence or absence of certain recognition sites in a DNA sample generates

variable lengths of DNA fragments, which are separated in 2 using gel electrophoresis. They are then hybridized with DNA probes that bind to a

complementary DNA sequence in the sample. Restriction Fragment Length Polymorphismis is one of the original applications of DNA analysis to

forensic investigation. With the newer development of more efficient DNA-analysis techniques, Restriction Fragment Length Polymorphism is

not used as much as it once was because it requires a large amount of DNA. In addition, samples can be degraded by environmental factors,

such as dirt or mold, do not work well with Restriction Fragment Length Polymorphism.

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