Fragile X syndrome is caused by a mutation on the FMR1 gene that prevents production of the FMRP protein. Males are more commonly affected and exhibit characteristics like prominent ears, long face, delayed speech, enlarged testes, and autism-like behaviors. Females may show fewer symptoms, with about half having normal intelligence. While there is no single cure, early intervention through education, therapy and medication can help those with Fragile X develop their skills and capabilities.