So basically, we have a 50% chance of producing a sperm cell that is carrying the X sex chromosome and a 50% chance of producing a sperm cell that is carrying the Y sex chromosome. Now, in contrast, if we take a look at this gamete formation process as it takes place in females because females always carry this pair of sex chromosomes so we have X chromosomes in both cases, the only type of Xcel that a female can produce is an X cell that carries the X chromosome. It can never contain a Y chromosome. 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?