Abstract
The aim of this study was to investigate the fate of a mutant allele in populations of Tribolium castaneum Herbst in an effort to gain some insight into the mechanisms of selection. The study was undertaken from both a genetical and an ecological point of view. The population growth curves and the proportions of life-history stages were determined for populations begun with adults at varying gene frequencies of the mutant allele. The changes in gene and zygotic frequencies and in population structure were recorded at regular intervals and related to the results of experiments assaying the effects of various biological components that may be involved in the selection process. The interrelations of ecological and genetical factors in determining the outcome of a selection process have not received the attention they deserve. Laboratory and field observations have empirically validated many of the predictions regarding natural selection made in population genetic theory, but little light has been shed on how selection operates. Selection is
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