These diagrams illustrate the idea of PCR. You are expected to have learned this in a previous class However, if you did not or if you don’t remember it then use these notes to refresh your memory and take a look at the Polymerase Chain Reaction.mov and read the book.

Once the template, the primers, the buffer and the enzyme are added to the tube the PCR machine basically does this:

Once the doubling starts it proceeds like this: