Question

What is the positive effect of being a carrier of sickle cell anemia? (check all that apply) (3 points) [ ] can avoid fruit flies [ ] don't officially have the disease [ ] do not have smptoms [ ] possible immunity against malaria

Answer 1

Select:
[x] don't officially have the disease
[x] do not have symptoms
[x] possible immunity against malaria

Explanation: Heterozygous carriers (sickle cell trait) do not have sickle cell disease and are usually asymptomatic, and they have partial protection against severe malaria. "Can avoid fruit flies" is unrelated. (Note: carriers can rarely have symptoms under extreme stress—low oxygen, dehydration—so "do not have symptoms" is generally true but not absolute.)