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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: practical effect to them in ways that we may not wholly foresee.''[1]
Galton formulated a general law of inheritance which declared that an
individual receives one-half of his inheritance from his two parents,
one-fourth from his four grandparents, one-eighth from his great-
grandparents, one-sixteenth from his great-great grandparents, and so
on by diminishing fractions to his primordial ancestors, the sum of
all these fractions added together contributing to the whole of the
inherited make-up. The trouble with this generalization, from the
modern Mendelian point of view, is that it fails to define what
``characters'' one would get in the one-half that came from one's
parents, or the one-fourth from one's grandparents. The whole of our
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