Abstract
The frequency of the black gene increased from 0.25 to over 0.28 in two generations of hybridization of the wild and Chicago Black strains of Tribolium castaneum. Population budgets constructed from census data taken at five-day intervals over both generations reveal marked differences in the mortality schedules of the three genotypes. Selection over a generation is explained as a two-step process involving differential production of bb eggs and high +b survivorship.
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