Changing Allele Frequencies

Respond to the following:

• Explained why the increased prevalence of sickle-cell disease among African Americans has more to do with the environmental factors than the skin color or other phenotypes used to define races. (10)
• Described other examples of balanced polymorphism. (10)
• Identified a population group (other than African Americans) with a high prevalence of sickle-cell disease. (10)
• Listed six genetic diseases more common among Ashkenazi Jews than among other population groups. (10)

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