Hey Bass!

I’m not sure how indepth you want me to describe PCR.. cuz, I don’t know how much background you’ve already had on this subject … here is a brief description (please reply if you need a more … in depth/molecular explanation)….

PCR (polymerase chain reaction) is a method that amplifies (or produces many copies) of a target/desired fragment of DNA. This is accomplished by using a DNA polymerase (Taq polymerase) that accurately copies DNA thereby producing numberous copies of DNA from very few original (template) DNA fragments.

You can generate a billion copies of a desired piece of DNA from 1 original copy (template) of DNA by performing PCR.

Here is a good resource:
http://en.wikipedia.org/wiki/Polymerase_chain_reaction

… if things still aren’t clear please write again and me (or someone else) can go through each step with you.

best wishes!
– KIM