The factors which are areas of potential biological variation in racial groups include electrocardiographic pattern, immune response and nutritional preferences.
A direct relationship is observed between race and body structure, skin color, other evident physical features, enzymatic as well as genetic changes, electrocardiographic patterns, vulnerability to a disease, nutritional preferences including insufficiencies and psychological traits.
A general discovery in African-Americans, specifically in African-American men, is the presence of inverted T-waves in the precordial leads of the electrocardiogram.
This deviation is a normal form of variation in the African-American people but would suggest a pathological condition if discovered in other racial groups like Whites.
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