The y { male } chromosome appears to be resultant of an aborted X { female } chromosome.
Suck on it males.
Pregnant female = 12-around-1 sphericals aka cubo{6}-octa{8}hedron and the Operating System of Universe { OSU }
Female = the stable 12-around-0 sphericals icosa{20}hedron
Male = less stable { unstable } pentagonal dodeca{12}hedron aka truncated { aborted } female { icosahedron }