Therefore, as I read your post again, the changes you speak of in the sperm and egg cells that get passed on must have changed in order for an organism to evolve. Is that right? On the other hand, as I said, I do not accept, believe, or think that because there is a short statured population and a long-legged population that has inbred for a long time and have distinctive characteristics en large that it means they are not humans, belonging to the current homo sapien family. That is not evolution, and it is not what I am talking about. Humans so far, within the thousands of years of recorded history, have remained humans. Nothing is recorded that says anyone saw a gibbon become a homo sapien. Or anything else other than a gibbon. Of course, that's only the past 5000 or so years.