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Prenatal Diagnosis: Heredity Disorders, Other Biochemical Diseases, and There are over 250 recognized sex-linked diseases, affecting every organ system. Of these, 95% affect males, (Emery, 1968). Despite these many sex- linked diseases, at present prenatal diagn ....

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.... blood-vessel problems that lead to high blood pressure, kidney failure and strokes.(Mulinsky, 1989). After many years of symptoms, most patients have died in their thirties and forties owing to a lack specific treatment. A biochemical disorder also caused by a missing enzyme is the Lesch- Nyhan syndrome, an extremely unpleasant disorder characterized not only by profound mental retardation and features of brain damage (stiff limbs with peculiar movements), but also self-mutilation, (Jones, 1988). Given good care and attention however, these patients may live on many years in their profoundly retarded state. They often require restraining, tying ....