What is the second most commonly recognized genetic cause of intellectual disability?

Name: What is the second most commonly recognized genetic cause of intellectual disability?
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The fragile X syndrome is the second most common genetic cause of intellectual disability (after Down syndrome). Fragile X, Klinefelter, and Turner syndromes not observed with enough frequency are to be recognized as the second most common cause of intellectual disability.

What Is the Second Most Commonly Recognized Genetic Cause of Intellectual