And so we only have one of these sex link genes and not two, as we have in the female case. Now, the last thing that I'd like to briefly talk about is the inactivation of the X chromosome in female individuals. So it turns out that in female individuals, in female somatic cells, one of the chromosomes, one of the X chromosomes is actually inactivated and we produce this structure known as the bar body. So in female somatic cells, one of the X chromosomes is typically inactivated by transforming that active X chromosome into an inactive X chromosome we call the bar body. Now, which one of the two sex X chromosomes are transformed into the bar body is random. And what that means is it's random which one of these will transform into the X body.