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. So we have two types of colors and two types of wings. We have the color gray, which is dominant over the color black and the color gray is given by uppercase uppercase g. The color black is given by lowercase g. By the same exact token, we have two types of wing types. We have normal wings and we have vestigial wings.