A detective finds a miniscule spot of blood on a murder suspect's shirt.What method would she expect the police lab to use to get enough DNA from the blood droplet to perform DNA fingerprinting?
A) inserting the blood's DNA into viral DNA
B) polymerase chain reaction (PCR)
C) inserting the sample's DNA into a plasmid
D) using ligases to bond the DNA fragments together for sequencing

Question

Quizplus · Accepted Answer

Polymerase chain reaction (PCR) is a technique used to replicate small amounts of DNA into larger, more easily analyzed samples. This would be the method used to amplify the DNA in the small blood spot to get enough to perform DNA fingerprinting. A and C are not relevant methods for this situation, and D refers to a different step in the process of sequencing DNA.

A Detective Finds a Miniscule Spot of Blood on a Murder