Fragile X syndrome is caused by a mutated recessive gene for a brain enzyme, hexosaminidase A (Hex A).

Name: Fragile X syndrome is caused by a mutated recessive gene for a brain enzyme, hexosaminidase A (Hex A).
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Fragile X syndrome is caused by a mutation in the FMR1 gene on the X chromosome, which leads to a deficiency of the fragile X mental retardation protein (FMRP), not by a mutation affecting hexosaminidase A (Hex A). Hex A deficiency is related to Tay-Sachs disease, not Fragile X syndrome.

Fragile X Syndrome Is Caused by a Mutated Recessive Gene