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The relationship of environment to selection

University of Minnesota

Abstract

A character expression is the result of the interworkings of inheritance and environment. Because of this, the possible respective effects of both inheritance and environment should be considered in the selection of breeding stock, especially where the objectives are to develop lines for specific purposes.

Attempts have been made to measure the relative importance of heredity and environment. Wright (1) made a study of the relative effects of heredity and environment on amount of white spotting in two stocks of guinea pigs, one that had been highly inbred and the other an outbred population. In actual units of measurements, the variance due to environment was almost the same in the two stocks, .354 for the inbreds and .372 for the oubreds. The per cent of variance due to environment, however, was markedly different in the two stocks; 97.2 per cent of the variance in the inbred stock was due to environment whereas environment was responsible for only 57.8 per cent of the variance in the outbred stock.