How does freidreich's ataxia differ from fragile x?

Completely different. These are completely different diseases. Both are genetic diseases. Freidreich's ataxia is an autosomal recessive abnormality of the fxn gene causing neurological disease, cardiomyopathy, and diabetes. Fragile x is an x-linked disorder causing mental retardation and autism.

Related Questions

How does freidreich's ataxia differ from fragile x syndrome and myotonic distrophy?

Triplet repeats.... All three are caused by a form of genetic instability involving dna triplet repeats, however they affect three different genes and cause three different diseases: freidrich's = degenerative neuro-muscular disorder; fragilex = mental retardation and behavioral disorder; and myotonic = progressive muscle wasting and weakness. Read more...