Peter Attia· MD
mouse sex chromosomes are quite a bit different than human sex chromosomes just to give you an example of some genes on the x chromosome do not get inactivated on the inactive x about 15 percent you know you get expression in both sexes in mice that's about three to four percent of the genes on the x chromosome getting activated there are also genes on the y chromosome in humans that are not on the y chromosome in mice and vice versa