All of the responses are true of PKU except that it is caused by a third 21st chromosome. Down Syndrome is caused by an extra copy of the 21st chromosome. Symptoms typically include delayed development, intellectual disability, and specific facial features. Unfortunately Down Syndrome cannot be managed by a change in diet. The most helpful interventions for Down Syndrome include parents, therapists, and teachers working together to support the child early on.

“Prosopagnosia” is the inability to recognize familiar faces. The other choices are incorrect. “Agnosia” is the inability to recognize familiar objects. “Akathisia” is a feeling of restlessness and agitation that may be caused by antipsychotic medications. “Anomia” is difficulty with naming objects. “Apraxia” is the inability to perform skilled movements.