DNA profiling was one of the greatest technological and scientific advances of the 20th century due to its effectiveness in identifying individuals. It is commonly used by forensic scientists to identify suspects or individuals at crime scenes. DNA profiling as it exists today was developed by two independent molecular biology studies carried out during the same period, in two different locations and by two different scientists. In 1985, Alec Jeffreys developed a technique called genetic fingerprinting, known as DNA profiling. And Kary Mullis invented the polymerase chain reaction, a biochemical technology in molecular biology used to amplify a single DNA sample over several orders of magnitude, generating millions of copies of a specific DNA sample. Modern DNA profiling is called STR, which is a very sensitive technique that helps CSIs identify criminals. This is the process by which a specific DNA pattern is obtained from a person or a sample of any body tissue. Typical patterns of genetic profiles are produced by electrophoresis of processed DNA samples. These patterns can be called fingerprints. In criminal investigations, approximately 10 DNA sites are tested. If the band patterns produced by the tested DNA samples of a suspect in a crime and the samples taken from the crime scene are the same, this constitutes sufficient evidence to convict a suspect and take him to prison. The 99% of human DNA is exactly the same for everyone, even though a single drop of blood or eyelash collected from a crime scene contains all the genetic information needed for every person in the world to convict an individual. criminal. DNA profiling is having a huge impact in many fields, from the middle of the article......: http://www.brighthub.com/science/genetics/articles/65420.aspx [Accessed: March 31 2014].Freeman, S. (2014). HowStuffWorks “How DNA Profiling Works”. [online] Retrieved from: http://science.howstuffworks.com/dna-profiling.htm [Accessed: March 31, 2014].Grow - Wisconsin Magazine for the Life Sciences. (2011). How DNA profiling works. [online] Retrieved from: http://grow.cals.wisc.edu/health/how-dna-profiling-works [Accessed: March 31, 2014].Museum, S. (2014). What is DNA profiling?. [online] Retrieved from: http://www.sciencemuseum.org.uk/whoami/findoutmore/yourgenes/whydoscientistsstudygenes/whatisdnaprofiling.aspx [Accessed: March 31, 2014]. Oak, M. (2014). The ten main scientific discoveries of the 20th century. [online] Retrieved from: http://www.buzzle.com/articles/scientific-achievements-top-ten-scientific-discoveries-of-the-20th-century.html [Accessed March 31 2014].