TRUEPeople who inherit two sickle cell genes, one from each parent, have a type of sickle cell disease called SS. This is commonly called “sickle cell anemia” and is usually the most severe form of the disease.
People who inherit a sickle cell gene from one parent and a gene for another type of abnormal hemoglobin (hemoglobin is a protein that allows red blood cells to carry oxygen to all parts of the body) from the other parent, have a different type of sickle cell disease.
Some types of sickle cell disease are very severe and some are more mild. The disease affects each person differently.