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Evolution of selfing from outcrossing recurrently occurred in many lineages, especially in flowering plants. Evolution of selfing induces dramatic changes in the population genetics functioning but its consequences on the dynamics of adaptation have been overlooked. We studied a simple one‐locus model of adaptation where a population experiences an environmental change at a given time. We first determined...
Antagonistically selected alleles‐–those with opposing fitness effects between sexes, environments, or fitness components‐–represent an important component of additive genetic variance in fitness‐related traits, with stably balanced polymorphisms often hypothesized to contribute to observed quantitative genetic variation. Balancing selection hypotheses imply that intermediate‐frequency alleles disproportionately...
Host–parasite coevolution can result in consecutive selective sweeps of host resistance alleles and parasite counter‐adaptations. To illustrate the dynamics of this important but little studied form of coevolution, we have modeled an ongoing arms race between Drosophila melanogaster and the vertically transmitted sigma virus, using parameters we estimated in the field. We integrate these results with...
We estimated mutational variance–covariance matrices, M, for wing shape and size in two genotypes of Drosophila melanogaster after 192 generations of mutation accumulation. We characterized 21 potentially independent aspects of wing shape and size using geometric morphometrics, and analyzed the data using a likelihood‐based factor‐analytic approach. We implement a previously unused analysis that describes...
Mating systems are expected to have a strong influence on both the dynamic of adaptation and the genetic architecture of adaptive traits. In particular, the bias toward the fixation of dominant or partially dominant beneficial mutations predicted under outcrossing (Haldane's sieve) is expected to be reduced under self‐fertilization. To test this prediction in plants, we considered domestication as...
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