Word: geneticist
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Ongoing studies of identical twins have measured achievement motivation--lab language for ambition--in identical siblings separated at birth, and found that each twin's profile overlaps 30% to 50% of the other's. In genetic terms, that's an awful lot--"a benchmark for heritability," says geneticist Dean Hamer of the National Cancer Institute. But that still leaves a great deal that can be determined by experiences in infancy, subsequent upbringing and countless other imponderables...
...officer Joseph Domenech told Time. The fao suspects that wild birds could spread the lethal h5n1 virus - which can jump to humans and has killed at least 60 people in Asia so far, including a chicken farmer in Thailand last week - to domestic poultry in Africa. According to Ethiopian geneticist Tadelle Dessie, huge flocks migrating to lakes in the Rift Valley pose a threat. Where poultry is kept outdoors, the risks are great, he says. The fao fears wild birds wintering in Africa might bring the disease north to Europe next spring. But some scientists think the threat is exaggerated...
...mother's family descended from the Yorubas in Ghana, it is exactly this kind of precision that has critics fuming. "I think it is a disgraceful thing to try to tell an African American that you can match them to any group in Africa now," says Bruce Jackson, a geneticist at the University of Massachusetts at Lowell and co-director of the African-American DNA Roots Project, a nonprofit research group that is digging into the genetic history of American blacks. Jackson says making such classifications is premature because not enough people have been tested to establish distinct markers...
...provocative step further. Writing in the Proceedings of the National Academy of Sciences, they reported that gay men don't respond to the chemicals the same way that straight men do. "It clearly substantiates the idea that there's a biological substrate for sexual orientation," says Dean Hamer, a geneticist at the National Institutes of Health and the author of Science of Desire: The Gay Gene and the Biology of Behavior (Simon & Schuster; 272 pages). "This is a highly significant result...
...understand better the genetic basis of cancer, Philip Leder, a molecular geneticist at the Harvard Medical School and his colleague Timothy Stewart, have bred a line of transgenic mice that may someday serve as a model for human breast malignancy. He designed a DNA hybrid consisting of a gene called c-myc, which has been implicated in animal and human cancer, linked to a regulatory segment of another gene that is expressed in developing and lactating breast tissue. Soon after female mice with the injected gene give birth and begin nursing, they grow sizable tumors in their breasts. Perhaps more...