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Yes it is hereditary and has an unusual hereditary manifestation. It can be passed through several generations before any symptoms of the disorder appear. Often families have no idea they carry the gene for FX Because the defect is created by the expansion of a segment of DNA on the FX gene it goes through several mutations before causing symptoms. .I am an unaffected carrier( which is also known as having the premutation, therefore do not have any symptoms of the disorder. However I have 2 children that have what is known as the full mutation of FX. They are affected by the disorder.