Fragile X syndrome is an inherited genetic condition identified by a break or a weakness on the long arm of the X chromosome, and associated with mental retardation. Described on this single-sheet information guide are the prevalence of fragile X syndrome, its increased rate of incidence in boys as compared to girls, physical characteristics,…

Fragile X syndrome is the most common cause of mental retardation next to Down syndrome. The syndrome is more prevalent in males because they only have one X chromosome, where the gene for fragile X is carried, while women have two X chromosomes and the normal gene can compensate for the affected chromosome. Certain physical features are…