How does DNA work, how are police able to track individuals by their DNA?

Question

How does DNA work, how are police able to track individuals by their DNA?

Answer 1

try

www.nddb-bndg.org/main_e.htm http://en.wikipedia.org/wiki/DNA

i think it is something to do with each person having an individual and unique genetic code and so if they police find a tiny bit (enough to be useful can be gained from a hair, drop of blood or saliva or ven a flake of skin) then they can put it into the data base as it will only have one unique match. also blood relatives may have very similar dna codes so police can identify the relative of someone that us a suspect.

Answer 2

DNA databases...

Answer 3

Each person with the exception of identical twins etc (there can me more than twins that are identical although it is rare)have different DNA.

DNA can be traced from hair, saliva, skin, blood, and other types of secretions you make.

The police are able to track you because they test the stuff they have which may be as simple as the saliva you've left on a drink bottle or the skin flakes which are constantly coming off you and get a DNA code. If you have been previously convicted then they will probably have your DNA on file. They may also have it if you've been in the army etc.

It also works if a close relative has had any convictions as they have a simalar code. You're brother/sister will have parts of DNA from the same parents as you they just won't be the same as yours.

They can also test your DNA either through a saliva or blood test. They then atch this to the DNA found at the crime scene.