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POLYGENIC MODELS FOR THE EVOLUTION OF HUMAN SKIN COLOR DIFFERENCES

FRANK B. LIVINGSTONE
Human Biology
Vol. 41, No. 4 (December 1969), pp. 480-493
Stable URL: http://www.jstor.org/stable/41449281
Page Count: 14
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
POLYGENIC MODELS FOR THE EVOLUTION OF HUMAN SKIN COLOR DIFFERENCES
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Abstract

A model has been developed for the evolution of polygenic traits due to four loci and applied to the genetic basis of human skin color differences. With optimizing selection and a 6% maximum difference in fitness the evolution of the range of human skin color differences would take about 800 generations with no dominance but about 1500 generations with 80% dominance. With this amount of selection, a model of a linear sequence of isolates indicates that significant differences in skin color could still have evolved even in the presence of 5% migration among neighboring isolates.

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