In diagram A, we have the following gene shown in black. So this is our gene. Let's suppose we expose this gene, this gene here, to a specific type of restriction enzyme we're going to call enzyme number one. Now what happens is once we expose the gene to this restriction enzyme, the restriction enzyme cuts or cleaves this gene at two different locations. So at this location, somewhere here, and in this location somewhere here. So at the end, once we expose this gene to this enzyme, we get three different DNA fragments.