Changes in the Heritability Components of Anthropometric Characters Due to Preselection and Environment during Migration

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Abstract
Changes in the genetic and environmental components of the phenotypic variance of 20 morphological characters were studied in Mexican migrant and sedentary populations. As far as the changes in variance components and the average values of traits were concerned, it was found that some traits were subjected to different forms of selection pressure, some changed within the limits of the norm reaction, and some remained unchanged.