In this example, we're going to discuss how to calculate the percent recombination between two genes and how to use the percent recombination to find what the Map units are, what the distance is in Map units between those two genes. So let's begin by taking a look at the following diagram. So in this diagram, what we're basically doing is we're taking two types of fruits lies. So in this example, we're going to study fruit flies. Now, we're going to study two types of traits and we're going to assume that the traits are in fact linked. So we're going to study the color trait which is linked to our wing type trait.