Why would you expect harmful traits to be rare?

Wht does it tel you ewen a trait is more common in certain parts of the world?

What causes the symptoms of sickle cell disease?

How can someone like Morgan have sickle cell disease when her parents don’t have the condition?

How would you describe the inheritance pattern of sickle cell disease?

What did Dr. Tony Allison want to measure and why?

How do you interpret the observations that sickle cell trait was more common in the humid lowlands?

How is the selective pressure on the sickle cell allele different depending on the environment?

Why would there be different conditions in different parts of the world that also protect from malaria?

How would you explain why these statements are inaccurate? a. Mutations are bad genes. b. Sickle cell disease evolved in order to fight off malaria. c. Sickle cell disease is a disease that only affects certain human populations and not others.