For which of the following conditions are persons of African ancestry at greater than average risk?

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Persons of African ancestry are at greater than average risk for sickle-cell disease and thalassemia. Sickle-cell disease is most commonly found in people of African descent, and thalassemia is more prevalent in people from Mediterranean and African regions. People of any ethnic group can have spina bifida, so it is not more prevalent in African ancestry.

For Which of the Following Conditions Are Persons of African