fragile X syndrome (redirected from Fragile X syndrome type 3)

fragile X syndrome [‚fraj·əl ′eks ‚sin‚drōm]

(medicine)

A hereditary condition resulting from a trinucleotide repeat at an inherited fragile site on the long arm of the X chromosome. Affected males usually have some characteristic facial features, enlarged testes, and mental retardation. Females with on fragile X chromosome and one normal X chromosome may have a lesser degree of mental retardation.