So female individuals always produce X cells that have X chromosomes. So how do we actually form a male individual? And how do we actually form a female individual? Well, to form a female individual, we have to have a sperm cell that carries the X sex chromosome. So we have the sperm cell that is carrying the X chromosome and it combines with the Xcel and the Xcel always carries that X sex chromosome. When they combine, they form a Zygote that contains two X chromosomes and so this will basically be a female.