Science: Toward Sex on Order

Can science help parents choose in advance the sex of their baby? The answer: not now, but perhaps before very long.

Biologists believe that a child's sex is determined at conception by the kind of male sperm that enters the female egg. If the sperm carries a Y chromosome, the child will be male. If it carries an X chromosome, it will produce a girl. The female egg has little to do with the boy-or-girl result.

All well and good, except that biologists have always had a hard time telling the difference between an X sperm and a Y sperm. Now,...

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