A gene known as HbS was the center of a medical and evolutionary detective story that began in the middle 1940s in Africa. Doctors noticed that patients who had sickle cell anemia, a serious ...

Molecules of sickle-cell hemoglobin ... of a chromosome is flipped and reinserted Opitz-Kaveggia syndrome Deletion A region of a chromosome is lost, resulting in the absence of all the genes ...

Each gene within that cell has a coding region. This region encodes the information used to make a particular protein, such as the hemoglobin in the red blood cells seen here. (Hemoglobin shuttles ...