McGraw-Hill Online Learning Center Test

McGraw-Hill Online Learning Center Test


1. Review the image and answer the following questions.

Why is there a correlation between the distribution of the gene for sickle cell and malaria?

A. Malaria eventually causes sickle cell disease.
B. The gene for sickle cell also confers resistance to malaria.
C. People with sickle cell trait are more susceptible to malaria.
D. The correlation is a coincidence only.


2. The presence of the sickle cell allele in areas where malaria is prevalent can best be referred to as ______________.

A. an adaptation
B. coevolution
C. a mutation
D. a coincidence
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