When a new gene arises on the X chromosome (males have one X chromosome and females two) it is likely to cease functioning much faster than genes that arise on other chromosomes. (sciencedaily.com)
Others gained or lost whole chromosomes, but gained or lost fractions of other chromosomes. (sciencedaily.com)
They were able to demonstrate that copies of X and Y chromosomes (but not other chromosomes) are distinguished and delivered to the daughter cells with a striking bias. (sciencedaily.com)