In the case of the male, we have one. So we have at least one X chromosome in each one of these cases. And that's because it's the X chromosome that carries those necessary genes that are needed for both genders. Now, in contrast, if we look at the Y chromosome, the Y chromosome only usually has one or several genes that are involved for giving that male their maleness. Now, whenever we're looking at genes on the X chromosome, those genes on the X chromosome are known as sex linked genes or X linked genes. And that's because these are the genes that express proteins that are necessary for the different types of traits that exist in males as well as females.