Dr.Pierce examines a 10-year-old who has intellectual disabilities,distinctive facial features,and an extra 21^st chromosome.Given this information,Dr.Pierce's diagnosis would most likely be

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The combination of intellectual disabilities, distinctive facial features, and an extra 21st chromosome is characteristic of Down syndrome. PKU is a metabolic disorder that is inherited and not associated with extra chromosomes. XYY syndrome involves an extra Y chromosome and does not typically present with distinctive facial features or intellectual disabilities. Anencephaly is a severe birth defect in which the brain is not properly developed and is not related to extra chromosomes.

DrPierce Examines a 10-Year-Old Who Has Intellectual Disabilities,distinctive Facial Features,and