Summary

PCR is a relatively easy lab technique which amplifies the amount of DNA present, much like living cells do in the beginning stages of a cell cycle. The main difference is that targeted segments of a chromosome or gene are copied, not the entire chromosome. Primers can be made that target this DNA sequence to be copied for genetic analysis and as more genes and genome sequences have been discovered from thousands of different organisms, the potential for using PCR expands. When used in combination with gel electrophoresis, it is possible to see differences in DNA and RNA lengths from a tissue sample and learn about the genetic makeup in a particular sample. PCR is now the primary method used for both DNA and RNA analysis.