Following women who preferentially inactivate either their maternal or paternal X chromosome could provide insights into sex differences in longevity.

“on the dominant X it would be interesting to um follow women and identify ones who partition more into a dominant maternal X and then a dominant paternal X in the women who have a dominant paternal X presumably that ex is better than the other ex and then I would like to see if there's a difference in the longevity of that father versus and it's not a random experiment so it sort of sucks but is that a better surviving male than another male that's otherwise comparable that that's one way I would try to get at that”