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This is really google qestion. For some blood types, evolution and environmental selective pressures are clearly important for their persistence. For example, the Duffy blood type includes a receptor that allows certain types of malarial parasites to enter the red cell. Thus, in some malarial areas of Africa, populations with Duffy-negative blood ...


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To answer your first question; it is not necessary that every trait have an evolutionary advantage. Neutral traits can persist in the population without having any adaptive value, or they can persist as a byproduct of another trait that does have adaptive value. Even a slightly detrimental trait can become fixed due to genetic drift. Take a look at this ...



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