Review Question - QID 215624

A 4-year-old boy is brought to your office by his parents who are concerned with his waddling gait. They are also concerned that he has difficulty going from a seated to standing position and he must use his arms for assistance. The boy's mother inquires about the chances of this disease affecting future children. Which of the following figures would be useful in depicting the genetic mode of inheritance of this disease and, therefore, in predicting the likelihood of other children being affected?