Glossary
Glossary
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- Fragile X syndrome
- An X-linked disorder that is the most common genetically inherited form of mental retardation currently known. Boys who inherit a Fragile X gene mutation usually develop the disorder, while girls who inherit the mutation are more likely to be carriers. (The mutation is unstable and tends to increase in size over succeeding generations, so that girls may eventually be affected as well, though the mental retardation is not as severe as in boys.) If you have a family history of mental retardation, testing can determine whether Fragile X is responsible and whether you are a carrier.
