Review Question - QID 109102

A 6-year-old girl comes with her parents to the physician’s office to initiate care with a new physician. The patient was recently adopted and her parents do not know her birth history; however, she has had some issues with fatigue. They were told by the adoption agency that the patient has required blood transfusions for “low blood count” in the past but they are not aware of the reason for these transfusions. Her temperature is 37.8°C (99.8°F), blood pressure is 110/84 mmHg, and pulse is 95/min. Physical examination is notable for conjunctival pallor, pale skin, and mild splenomegaly. A complete blood count is taken in the office with the following results:

Hemoglobin: 6.8 g/dL
Leukocyte count: 5,000/mm^3
Platelet count: 190,000/mm^3

Peripheral smear shows echinocytes and further analysis reveals rigid red blood cells. The most likely cause of this patient's symptoms has which of the following modes of inheritance?