actually I don't know about the thinning hair genes coming from the mother's side. No one on my mom's side is bald but my 1/2-brother was completely bald by the time he was 30. I think if Jon was going to lose his hair, like go completely bald, we would have seen more evidence of it by now. Of all my friends and family who have lost their hair, most of their hair was gone by mid 30's.