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• W2270415037 abstract "1. Growth of Drosophila melanogaster populations which were simultaneously subject to intense natural selection for marked fourth chromosomes was characterized in terms of number of progeny and a finite population growth rate.2. There is no indication that the conditions experienced by past generations influenced the population growth potential of a cohort of adult flies; that is, population dynamics possess Markovian properties, justifying their characterization from observations of single-generation transitions.3. The three karyotypes studied in this system exhibited parallel reductions in growth rates to increasing population density; they differed in carrying capacity or equilibrium density inconsistently and to a lesser degree than was suggested by adaptive values.4. Experimental variation of the genetic composition of parental cohorts had almost no effect on population dynamics, but population growth rates declined markedly with increasing population density. Selection in this system has been found to be density-independent, but fitness of each genotype depends on population composition.5. As a consequence of point 4, there is no discernable relationship between gene and population dynamics in this system. In particular, the theoretical segregational load and population growth rates were statistically uncorrelated.6. This system is discussed in relation to the concept of soft selection. These data suggest that the definition of soft selection is less precisely related to the concepts of density-dependent and frequency-dependent selection than has been proposed." @default.
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• W2270415037 date "1977-10-01" @default.
• W2270415037 modified "2023-09-25" @default.
• W2270415037 title "STUDIES IN THE DYNAMICS OF GENETICALLY VARIABLE POPULATIONS. II. GROWTH OF EXPERIMENTAL POPULATIONS OFDROSOPHILA MELANOGASTEREXPERIENCING INTENSE NATURAL SELECTION" @default.
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• W2270415037 doi "https://doi.org/10.2307/1540434" @default.
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