1. Among African Americans, how common is sickle celldisease? How common are carriers of the sickle cell allele in this same ethnic group?
2. People from what other parts of the world also have arelatively high incidence of the sickle cell allele?
3. How does sickle cell disease affect red blood cells?
4. What are the symptoms of a sickle cell crisis?
5. What treatments exist for sickle cell disease?