Ok, believe it or not, I was on to this already. In fact, my father has been telling me about this for a very long time now. And, if you just think about basic biology a little, it makes efficient sense. Females, those with two X chromosomes, are born with all of the eggs they will ever have, and those numbers get reduced over a lifetime, until menopause hits and the show is over. Males, well, they’re like a chromosome tap, something that starts at puberty and keeps the production line of sex cells flowing until death. Since females have a limited opportunity to have offspring, they must be more choosy and careful with their breeding choices, whereas men clearly have the equipment to produce many, many more children. So, from the standpoint of evolution, it would make sense if females changed more conservatively over time with respect to selection pressures, and males would be able to change more quickly to immediate environmental pressures. Hence, females have two, big, fat X’s and men have one X and one tiny Y. Those X’s can act as backup for females, but for males, they have one and only one X, so that is all they get, plus their itty, bitty Y.

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