Describe the steps a scientist would use to make a dna fingerprint from the cells found beneath a murder victim's fingernails

The steps of taking a genetic fingerprint on a crime scene are:

* Samples are first taken from the crime scene. -> DNA sampling

Samples arriving at the laboratory under seal are treated independently of each other by scientists.

* The biological sample undergoes a first treatment that consists in extracting all the DNA. -> DNA extraction

* The DNA is analyzed and the results are interpreted. -> RFLP (restriction fragment length polymorphism) technique and electrophoresis, as well as PCR.

The laboratories authorized to carry out the analyzes relating to the human genetics are chosen with the greatest care by a commission of approval which applies draconian specifications to verify scrupulously the conformity of the equipment of the places.