How is DNA tested and why?
by DNA fingerprinting method , DNA-DNA hybirdization or DNA sequencing.
to know the sequence of DNA
DNA can be tested for a number of things. Perhaps the most prominent thing that DNA can be tested for is Genetic diseases caused by Mutations. The genetic diseases can be tested for and so can acquired diseases. You can also test DNA to see who is the parent of a child, and to check for evidence at a crime scene.