Word: xy
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Dates: during 1990-1999
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...female status and won, even before the I.A.A.F. changed its procedures. She hopes to compete in this summer's Olympics, which will be held in her native land. Luckily for her fellow track stars, Olympic officials will now accept an I.A.A.F. certificate of femininity instead of chromosomal proof. But XY women in other sports will be out of luck, unless the International Olympic Committee updates its policy...
...with genetic material from a wide range of male and female mammals, from chimps to tigers. Only one segment, which contained the SRY gene, was present in all the males and absent in all the females. Working with the ICRF team, London's Medical Research Council scientists showed that XY mice, which are female despite a Y chromosome, are missing part of the SRY gene...