![]() In the late 1970s, Ericsson leased the method to clinics around the U.S., calling it the first scientifically proven method for choosing the sex of a child. ![]() ![]() He would sometimes demonstrate the process using cartilage from a bull’s penis as a pointer. 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. Ericsson had grown up on a ranch in South Dakota, where he’d developed an Old West, cowboy swagger. The sperm with the Y chromosome were leaner and faster and could swim down to the bottom of the tube more efficiently. 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. ![]() He sent the two kinds of sperm swimming down a glass tube through ever-thicker albumin barriers. 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. ![]()
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