That was not my response. I didn't get that far. Not that the Y was unacceptable. I was pointing out that the more interesting ancestral argument might be about Noah's wife, to which I was told I could not tell male from female. Or something like that.
Perhaps it was the way you suggested the use of the 'X' chromosome?
It may very well be an interesting question, but the female most recent common ancestor is a number of years farther in the past than that postulated by the Biblical literalists.
I did not see where it was stated you can't tell the difference between a male and a female, but given that it happened, I was not one who did.