Dictionary of Human Evolution and Biology

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Specific reading disability. Thought to be caused by chemical disruption during the third trimester (7th month) of gestation. The DYX1 gene is an autosomal dominant; one of nine types of similar effect with a genetic basis. The condition exhibits incomplete penetrance; heritability is about 60%. Dyslexia has a prevalence of about 5-6% in American school-age children.

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From "Dictionary of Nursing and Individual Health Care"