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. Why are there more people with sickle cell disease in one part of the world than in other parts? - sickle-cell disease more condition_symptoms

First, there is a genetic disease, people who tend the gene (children, parents, grandparents, uncles shares cousins ,...) to near their parents.

A second factor relates to the development of the disease. The Gene as a protective response of the environment developed. People with the disease in some resistance to malaria, b / c the parasite can not thrive in their cells. In fact, if one shows a world look like the areas that are often of malaria, the same areas also show higher rates of sickle cell anemia.