Imagine That You Are a Detective Who Has Identified a Suspect

Imagine that you are a detective who has identified a suspect in a homicide. You acquire a small amount of blood from the crime scene and hand it over to your lab. The lab performs PCR for one polymorphism, and it returns as a match to your suspect. Is this enough to arrest your suspect?

A) Yes, a match between DNA fingerprints is always definitive proof that the two sources are the same individual.
B) Yes, the chance that your suspect will have the same polymorphism at a single site as a drop of blood from a random individual is about 1 in 50,000-this is enough to arrest the suspect.
C) No, your lab should assess additional polymorphisms-a single polymorphism does not constitute a DNA fingerprint.
D) No, the small amount of blood you acquired from the crime scene will not provide enough genetic material for PCR to be performed efficiently-more than a single drop of blood is needed to provide enough raw material for analysis.