Word: xy
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Dates: during 1980-1989
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...find out how sexual differentiation works, Page and his team decided in 1981 to study the sex chromosomes of people who are genetically abnormal: men with two X chromosomes and women with an X and a Y. Despite the genetic reversal, the XX men and XY women, although infertile, appeared normal. The scientists showed that one X chromosome in these men always had a tiny bit of Y attached, while the women's Y chromosomes always lacked that same tiny bit. The TDF gene, they figured, must be contained in that fragment, which sometimes breaks off from...