We're going to use something called a restriction enzyme to build a genetic library. Now what exactly is a genetic library? Well, a genetic library for some given organism is basically a collection of all the different types of genes that are are found on the DNA molecule for that particular organism. So let's take a look at the following seven steps that basically describe how to build a genetic library. And for simplification purposes, we're going to examine a hypothetical organism that has a DNA that only consists of four different types of genes. So let's take the following DNA of some hypothetical organism that consists of gene one shown in green, gene two shown in purple, gene three shown in red and gene four shown in orange.