Science: 28 Million Who Pass


A glance tells that many Americans who are classified as Negro have plenty of European "blood"; white people with Negro blood are harder to distinguish. Their African genes may not affect their appearance and they usually do not know that some of their ancestors "passed." In the Ohio Journal of Science, Sociologist Robert P. Stuckert of Ohio State University attempts to estimate how many white Americans have some African ancestry.

Using a complicated mathematical method, Dr. Stuckert constructs a "genetic probability table" that shows the changing composition of the population since 1750. To do this he assumes that "the probability of persons...

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