Turner's Syndrome
Turner's syndrome affects females where there is a defect in one of the two X chromosomes: in 50 per cent of the cases it may be absent, so that they have total of 45 chromosomes rather than 46. Intellectual development may be normal, but some have learning difficulties. There are associated abnormalities in growth, and the ovaries fail to develop causing infertility. Growth hormone therapy and the provision of oestrogen at the time of puberty will promote normal development, but will not produce fertility.
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