A Nurse Is Helping Prepare a 9-Month-Old Patient for Blood

A nurse is helping prepare a 9-month-old patient for blood chromosome analysis for a suspected chromosomal disorder.The patient's mother is concerned because he is not able to turn over from his back to his belly, sit upright, or crawl.The nurse observes that the patient startles dramatically to loud noises.Which of the following autosomal chromosome defects is most associated with these findings?

A) Cystic fibrosis
B) Cri du chat
C) Down syndrome
D) Tay-Sachs

Correct Answer:

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