Background Paragraph: Some individuals have a specific mutation in the primary sequence of their hemoglobin molecules that causes them to aggregate, resulting in a deformation of their red blood cells. This abnormality is genetic in nature. A person may inherit the gene from one parent and have sickle cell trait (only some of the hemoglobin is hemoglobin S), which is usually not life-threatening. Inheriting the gene from both parents will result in sickle cell disease, which is a very serious condition. 
Story: Pete and Mike were two brothers. Pete had no health problems, while Mike inherited the sickle cell trait. Mike had adjacent health problems.
Which brother did not inherit a genetic disease from one of his parents? Which brother didn't have  any abnormalities that were genetic in nature? Which brother didn't have a specific mutation in the primary sequence of his hemoglobin molecules? Which brother didn't have any hemoglobin S in his blood? Which brother didn't have molecules of hemoglobin that aggregate? Which brother had a specific mutation in the primary sequence of his hemoglobin molecules? Which brother had an abnormality that was genetic in nature? Which brother had molecules of hemoglobin that aggregate? Which brother had some hemoglobin S in his blood? Which brother inherited a genetic disease from one of his parents?