Abstract
Selection experiments between a lac + wild type and a lac − mutant of Escherichia coli were conducted using a serial transfer prcedure at two levels of total sugar concentration, i.e., 0.750 g/l and 1.0 g/l. The relative frequencies of both genotypes were assayed every 48 hours, at the time of transfer and the frequency changes were followed for about four weeks. The frequency of lac − decreased steadily and it was eventually eliminated from the mixed populations in all replicate cultures. The regression of logit pt was shown to be not linear but curvilinear, indicating that fitness differentials are frequency-dependent. The selection is also probably density-dependent.
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Kosuda, K. On the mode of selection in escherichia coli. Genetica 55, 17–21 (1981). https://doi.org/10.1007/BF00133998
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DOI: https://doi.org/10.1007/BF00133998