Which demographic information could have an important influence on susceptibility to disorders that have a strong genetic component?

Question

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Ethnicity is critical personal information to determine because some genetic diseases are more common in people who are from certain ethnic groups. For example, Tay-Sachs disease and Gaucher disease are at least 10 times more common among people of Ashkenazi Jewish heritage (regardless of what religion they practice) than among non-Jews. A person's ethnicity does not change and cannot be modified. Education, profession, and nutrition status have little, if any, influence on the expression of a genetic disorder.

Which Demographic Information Could Have an Important Influence on Susceptibility