Abstract
The University of Kansas research program described in this volume is a continuation of a theoretical interest that I initiated in 1969 with the study of genetic, demographic, and morphological microdifferentiation of transplanted Tlaxcaltecan populations of Mexico. The primary objective of the Tlaxcaltecan project, performed between 1969 and 1975, was to measure evolutionary changes in human populations transplanted from their valley of origin (approximately 400 years ago) into markedly diverse environments. The complicating variable in that study was the gene flow from the Spanish colonial administration and from the surrounding indigenous peoples into the transplanted communities (Crawford, 1976). Only limited and conservative conclusions could be drawn concerning evolutionary rates and genetic microdifferentiation.
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