Genetic Variation and Indeterminism in Interspecific Competition

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Abstract
Selection for fast developmental rate in populations of the flour beetles Tribolium confusum and T. castaneum derived from inbred lines and their reciprocal hybrids was provided evidence to substantiate the hypothesis that indeterminacy of outcome in competition experiments is the result of genetic heterogeneity of the founders of the competing populations. Selection was successful only in those inbred lines where indeterminacy of outcome had previously been observed, and hence, according to the hypothesis, genetic variation existed.

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