Achondroplasia is a single gene disorder? caused by mutations? in the
FGFR3 gene? on chromosome? 4. Two different mutations in the
FGFR3 gene cause more than 99 per cent of cases of achondroplasia. It is a dominant? genetic disease so only one copy of the
FGFR3 gene needs to be mutated for symptoms to develop.
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