A disorder that causes mental retardation that becomes progressively worse as children get older and is also strongly associated with autism is known as ________________.

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Fragile-X syndrome is a genetic disorder that causes intellectual disabilities that become more severe as individuals get older. It is also strongly linked to autism spectrum disorders. Down syndrome, Klinefelter's syndrome, Turner's syndrome, and Huntington's disease all have different symptoms and causes.

A Disorder That Causes Mental Retardation That Becomes Progressively Worse