Chromosome Variations

Excerpt from the July 27, 1963, issue of Science News Letter

The normal number of chromosomes in each human cell is 46, but it can vary in different cells … Dr. D.G. Harnden of the Medical Research Council, Edinburgh, Scotland, told the International Conference on Congenital Malformations in New York…. Among others from the nine countries attending the conference was Dr. Mary L. Lyon, of the Medical Research Council Radiobiological Unit, Harwell, England, who originated the theory that woman is a genetic “mosaic”…. Dr. Lyon’s theory is that only one of...

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