Word: sperms
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Meanwhile, more single women--especially those watching their biological clocks run down--are resorting to solo pregnancies, sperm donors or adoption agencies. While the birthrate has fallen among teenagers, it has climbed 15% among unmarried thirtysomethings since 1990. In the TIME/CNN poll, fully 61% of single women ages 18 to 49 answered yes when asked whether they would consider rearing a child on their...
...alone. One female critic returned more than once to trash the play. "She said this was a cop-out, my saying women could be happy having a baby alone," the playwright says. Last year Wasserstein, still single at 49, gave birth to a daughter, Lucy Jane, conceived with the sperm of a friend she won't identify. "If I put Heidi out now, people would just say, 'Yeah, that's true,'" she says, shrugging...
...were genetically abnormal and unstable. Building on the initial technique, Yamanaka's group, as well as those led by Rudolph Jaenisch at Whitehead and Konrad Hochedlinger at HSCI, showed that the process does indeed work-and can generate stable stem cells that go on to develop into eggs and sperm that can produce healthy mice. "It's very exciting and we look forward to all there is to do from here," says Dr. Renée Reijo Pera, director of Stanford University's Institute for Stem Cell Biology and Regenerative Medicine...
...nucleus removed. This hybrid then begins to divide, and within a few days, generates stem cells that are genetically identical to the patient. The problem, however, as Eggan puts it, is that "there are never any extra unfertilized eggs hanging out at IVF clinics." That's because unlike sperm, an egg cannot be frozen without destroying its integrity. Most clinics will fertilize every egg, and freeze them at various stages of development...
...think that the egg probably carried an X and one sperm an X, and one sperm a Y. It's possible that it is far more complicated than that. But that's the simplified explanation," says Souter. The twins have different proportions of male cells (XY) and female cells (XX), and are chimeric, meaning they have tissue with a diverse genetic make-up. Twin A, identified as a hermaphrodite, has 5% XY and 95% XX after genetic testing of the skin. Comparatively, Twin B, the male...