How is DNA fingerprinting used to identify a criminal?
My house was broken into last week; the police can identify the culprit some blood found at the scene. How can they do that? To understand this, we need to state that what is meant by DNA fingerprinting and what does DNA fingerprinting describe some information. The burglar smashed a window leaving blood on the broken glass. Samples of blood hair or skin can be collected from a crime scene. The forensic scientist investigates the samples in a lab. First, they extract DNA from the cells; they use enzymes to cut the DNA into shorter fragments. The fragments are placed into a well in a gel; they are separated using an electric current. Different size fragment travels different distances in the gel. The smallest fragments the farthest, a pattern of balance is produced this can be compared with the patterns from possible suspects. The enzymes cook different people’s DNA in different places producing a different set of fragments. The different sets of DNA fragments will produce different patterns of bands when separated on a gel. Each person has unique DNA which will produce a unique band pattern that can be used to identify them If two patterns match the samples are the same person. So the police can identify the man who burgled my house using this unique DNA fingerprint.