Which genetic disorder is the leading inherited cause of intellectual disability?

Question

Quizplus · Accepted Answer

Fragile X syndrome is the leading inherited cause of intellectual disability. It is caused by a mutation in the FMR1 gene, which leads to difficulty in producing a protein essential for brain development and function. Down syndrome is a genetic disorder caused by an extra copy of chromosome 21, while phenylketonuria (PKU) and Praeder-Willi syndrome are also genetic disorders, but not the leading cause of intellectual disability.

Which Genetic Disorder Is the Leading Inherited Cause of Intellectual