Because if it takes place in meiosis, every somatic cell of the body will end up having this unemployed condition. But in mitosis, it's only those two daughter cells that are formed by that process that will have that condition. So as long as our immune system can protect our body from those abnormal cells, we should have no problem. So if a normal X cell combines with either sperm cell one or sperm cell two, the Zygote will have an extra X chromosome copy. So we'll have XY. Now, if the normal Xcel combines with either sperm cell three or four, we're going to have Zygote in which we're going to lack the Y chromosome.