Will Men become Obsolete?
In the 1970s the biologist Ronald Ericsson came up with a way to separate sperm carrying the male-producing Y chromosome from those carrying the X. He sent the two kinds of sperm swimming down a glass tube through ever-thicker albumin barriers. The sperm with the X chromosome had a larger head and a longer tail, and so, he figured, they would get bogged down in the viscous liquid. The sperm with the Y chromosome were leaner and faster and could swim down to the bottom of the tube more efficiently. Ericsson had grown up on a ranch in South Dakota, where he’d developed an Old West, cowboy swagger. The process, he said, was like “cutting out cattle at the gate.” The cattle left flailing behind the gate were of course the X’s, which seemed to please him. He would sometimes demonstrate the process using cartilage from a bull’s penis as a pointer.
http://www.today.com/id/38279151/site/todayshow/ns/today-relationships/t...
Fortunately, unlike reptiles, temperature has no effect on nature's gender selection in human beings. So, despite X chromosome being 3 times heavier than Y chromosome, the ratio indicates they both reach their target neck-to-neck..:)
I m obsolete already.
usage of such things merely to point out is outrageas hope this will not be human future but the world population ration is very bad only 8 wo for 10 men