2-year-old child is seen for a well-child visit in a pediatric clinic. Abdominal examination demonstrates a palpable, non-tender mass on the left side of the abdomen. The mother had no idea where the mass was present and the pediatrician did not note the presence of the mass at the child's 18-month well-child visit. Physical examination is otherwise unremarkable. Abnormalities of which of the following chromosomes have been linked to this disease?