How are features of Fragile X Inheritance unique?

In many X-linked conditions, only males who inherit the atypical gene are affected. Fragile X syndrome is one of the X-linked conditions that can also affect females. 

Additionally, in other X-linked conditions all males who carry the atypical form of the gene are affected. In Fragile X syndrome, unaffected males can carry the gene in the premutation form while themselves having no symptoms of Fragile X Syndrome.

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