Dr.Pierce examines a 10-year-old who has mental retardation,motor retardation,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 distinctive facial features and extra 21st chromosome in the karyotype are characteristic of Down syndrome. The other options do not fit with the given symptoms and diagnosis. PKU is a metabolic disorder, XYY syndrome presents typically with tall stature and behavioral issues, and anencephaly is a severe neural tube defect that is usually fatal.

DrPierce Examines a 10-Year-Old Who Has Mental Retardation,motor Retardation,distinctive Facial