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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Pivot of Civilization by Margaret Sanger: parts. We are interested rather in those more specific traits or
characters, mental or physical, which, in the Mendelian view, are
structural and functional units, making up a mosaic rather than a
blend. The laws of heredity are concerned with the precise behavior,
during a series of generations, of these specific unit characters.
This behavior, as the study of Genetics shows, may be determined in
lesser organisms by experiment. Once determined, they are subject to
prophecy.
The problem of human heredity is now seen to be infinitely more
complex than imagined by Galton and his followers, and the optimistic
hope of elevating Eugenics to the level of a religion is a futile one.
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