Mark is hyperactive, often flaps his arms wildly about, and will bang his head against a wall over and over for no apparent reason. He cannot relate to his peers very well and uses very bizarre language. His doctors have excluded him from a diagnosis of autism, because genetic testing revealed that damage to a chromosome can account for his symptoms. Mark probably has

Question

Quizplus · Accepted Answer

Fragile X syndrome is a genetic condition caused by a mutation on the X chromosome and is associated with symptoms such as hyperactivity, repetitive behaviors, and difficulties in social interactions, which align with Mark's symptoms.

Mark Is Hyperactive, Often Flaps His Arms Wildly About, and Will