Word: dna
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Deep in Clinton's past there are other motives for him to carry on. Fighting to the death is an impulse engraved in his DNA. Before he could walk away from the presidency, he would have to walk away from the example set by his mother Virginia Kelley, and not just in the way she battled to raise him after the death of his father and her remarriage to an alcoholic who made life difficult for them. Twice during her career as a nurse-anesthetist, Kelley was involved in struggles to save her job over episodes in which she felt...
...Virginia scientists, though, adapted a technique that has been used for more than a decade to select the sex of cows, horses and pigs. Working with U.S. Department of Agriculture scientist Lawrence Johnson, who invented the method, they stained sperm with a fluorescent dye that latches onto DNA. Measuring the glow of the sperm cells under laser light, they could gauge how much genetic material each one carried. As it happens, X chromosomes have about 2.8% more DNA than Ys. Once the sperm had been distinguished this way, an automated sorting machine separated the Xs from the Ys, and doctors...
Through the most sensitive DNA testing, RFLP testing, the FBI Laboratory determined conclusively that the semen on Ms. Lewinsky's dress was, in fact, the President's. The chance that the semen is not the President's is one in 7.87 trillion...
...beautifully simple idea. Since sperm bearing a Y chromosome (the one that creates little boys) contains nearly 3 percent less DNA than its female X chromosome counterpart, why not sort sperm by its genetic weight -- and stack the deck for couples who want to choose the sex of their child? Easier said than done, of course. But that's precisely the technique that a Fairfax, Va., fertility center is set to reveal Wednesday in the journal Human Reproduction. Based on the information released so far, this appears to be the most reliable gender-selection process ever developed...
...technique perfected by the not-for-profit Genetics & IVF Institute involves staining sperm cells with a DNA-sensitive fluorescent dye and then passing them single file through a laser beam. The cells are sorted based on the amount of light reflected by the fluorescent DNA. It's painstaking work -- sorting a single batch takes the better part of a day -- but the results speak for themselves: Of 14 pregnancies produced so far for couples who wanted a girl, 13 fetuses were female. Not entirely foolproof, but pretty close...