Which variable has an impact on the frequency of sickle cell anemia?

Which variable has an impact on the frequency of sickle cell anemia?
a. The color of an individual’s skin
b. The presence of malaria
c. The age of a population
d. The incidence of HIV

What did early approaches to anthropology mainly focus on?
a. Race and racial classifications
b. Human evolution
c. Societally defined group designations
d. Natural selection

What is thought to be a selective agent for cystic fibrosis, creating a balanced polymorphism in some populations?
a. Malaria
b. Sickle-cell anemia
c. Tuberculosis
d. Influenza

Which group of people is lactose intolerant?
a. Children with the dominant allele for lactase
b. Northern European children
c. Only Asian adults
d. Most adult humans

Who is most likely to find it useful to use group designations such as “American Black” and “American White”?
a. A geographer cataloging the settlement of populations in Central and South
America
b. A geneticist looking at gene flow between Africa and different North and South
American populations
c. An anthropologist who is studying human evolution in the United States
d. A medical scientist who is investigating a disease in the United States