DNA profiling is the process where a specific DNA pattern, called a profile, obtained from a person.
Even though we are all unique, most of our DNA is actually identical to other people’s DNA. However, specific regions vary highly between people, these regions are called polymorphic. Differences in these variable regions between people are known as polymorphisms.
Each of us inherits a unique combination of polymorphism from our parents. DNA polymorphism can be analysed to give a DNA profile. DNA profiles can be used to identify the origin of a DNA sample at a crime scene. Forensic scientists collect samples from crime scenes, and then DNA can be collected directly from a suspect using a mouth swab, to see if it matches the DNA taken from the crime scene. So, DNA profiling is a very useful tool for investigating a crime.