염색체가 Y가 작고 가벼워서 남자가 여자보다 5%정도 많이 태어난다는 영상들
https://www.youtube.com/watch?v=xiJ7y83jCzEhttps://www.youtube.com/watch?v=RCj7FOq1Ob4https://www.youtube.com/watch?v=NeBzFyd7icshttps://www.youtube.com/watch?v=mUbBkhhYo7Mhttps://www.youtube.com/watch?v=f710tLjuirE