Multiple choice

Sickle-cell trait was selected by nature in whole Central Africa because

  1. it provides prominent immunity to chronic anemia

  2. it provides little immunity against malaria

  3. it provides little immunity against thalassemia

  4. it provides little immunity against gout
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The microscopic organisms that cause malaria are parasites on normal red blood cells. Full-blown sicklers produce abnormal and deformed red cells. As a result, they are poor hosts for this disease and are immune. However, they are frequently anemic.

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