Word: xyy
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Dates: during 1967-1967
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...normal man has one x, but his y chromosome is decisive and establishes maleness. A fairly common case of "one chromosome too many" is an xxy combination, but this is accompanied by external male genitalia and poor, nonathletic physical development. More probably, Ewa is a mosaic, with some xyy cells, and others containing a single x and nothing else...