I think it's not quite 1:1 in humans, the males have a slight lead. http://www.scientificamerican.com/article/is-a-pregnant-womans-chan/ http://www.scientifica

I think it's not quite 1:1 in humans, the males have a slight lead. http://www.scientificamerican.com/article/is-a-pregnant-womans-chan/ http://www.scientificamerican.com/article/is-a-pregnant-woma...