What is the relationship between the places where malaria is common and where the sickle cell allele is commonly found?

At a global scale, the sickle cell gene is most commonly found in areas with historically high levels of malaria, adding geographical support to the hypothesis that the gene, while potentially deadly, avoids disappearing through natural selection by providing protection against malaria.Nov 2, 2010

Explanation:

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answer; polycythemia is the correct answer;