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Fragile x syndrome (fxs) is delayed development, increased activity, and

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Explanation:FXS is an X-linked semi-dominant condition with REDUCED penetrance. It is caused by an expansion of an unstable CGG TRINUCLEOTIDE repeat in the fragile X gene (FMR-1). In ADDITION to being associated with characteristic PHYSICAL and behavioural features, causes intellectual disability RANGING from mild to severe.



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