Heredity: Research Makes It Official: Women Are Genetic Mosaics

The cocktail-party bore who laces his chatter with the tiresome cliche about "crazy, mixed-up women" has more medical science on his side than he knows—and more than medical scientists themselves have recognized until recently. Even normal women, it appears, are mixtures of two different types of cells, or what the researchers call "genetic mosaics." If both cell types are normal, so is the woman. But if one is defective, though a woman may seem to enjoy good health herself, she may pass on hereditary disorders to her children. And oddly, the victims...

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