Science News, June 7th, 1986
X chromosomes: Too few and too many
One to two infants per 1,000 have an abnormality in their number of sex chromosomes. These conditions, once thought to cause mental retardation, are now considered instead to have more subtle and variable psychological effects.
One child with a sex chromosome abnormality (SCA) may have numerous difficulties, while another with the same abnormality may appear quite normal, report scientists from the Denver-based National Jewish Center for Immunology and Respiratory Medicine. In Philadelphia last week, at the annual meeting of the American Association for ...
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