Fragile X syndrome is characterized by

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Fragile X syndrome is caused by an abnormality on the X sex chromosome, specifically a mutation in the FMR1 gene which produces fragile X mental retardation protein (FMRP). This protein plays a role in the development and function of the brain, and when it is not produced in sufficient quantities due to the mutation, it can lead to intellectual disability, behavioral and emotional problems, and physical features such as a long face and large ears. There is no extra or missing sex chromosome involved in Fragile X syndrome.

Fragile X Syndrome Is Characterized by