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[–] european [S] ago 

I thought the y was essentially mostly a remnant or subset of an x. I did not suggest men are missing genes , more that there is redundancy in the event of deleterious mutations.

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[–] luckyguy ago 

The Y is a decedent of the typical X chromosome but their departure from one another is as old as mamalia. They would be as genetically unique from one another as my X would be from a platypus's X. At least as I understand it.

You edited your post didn't you?