Genetics: Mosaic in X & Y

"There's nothing like a dame," sang the Navymen in South Pacific. Not so, say physiologists. There are people who are something like a dame but are really men, or even a combination of male and female because nature has scrambled their chromosomes. Last week a star Polish athlete found "herself" in one of these anomalous categories and was barred on medical grounds from international competition.

Ewa Klobukowska, 21, born in Warsaw, was raised as a girl and always thought of herself as a girl. She grew to a lithe and powerful 5 ft. 7...

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