Miscellaneous genetic disorders Quiz: Ace Your Exams

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A 6-year-old adopted boy is brought to the physician to discuss his genetic testing results. The child had been having difficulties communicating with others in the classroom and was subsequently diagnosed with autism spectrum disorder and an intellectual disability. The genetic testing confirms a diagnosis of Fragile X syndrome. Which of the following family pedigrees represents this patient’s biological family history? (Arrows indicating the patient).  

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