Review Question - QID 110036

A 4-month-old boy is brought by his mother to the pediatrician for a routine check-up. He was born at 39 weeks’ gestation. Apgar scores were 8 and 9 at 1 and 5 minutes, respectively. The child has been breastfeeding well and sleeping through the night. He smiles spontaneously and has started to babble. He is up to date on all his vaccinations. His temperature is 98.6°F (37°C), blood pressure is 130/85 mmHg, pulse is 82/min, and respirations are 20/min. On exam, he is able to hold his head steady while unsupported and is noted to roll over from the prone to the supine position. Mild hepatomegaly is noted along with palpable bilateral abdominal masses. This patient’s condition is associated with a mutation in which of the following chromosomes?