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Review and framework articles, which are commonly used to synthesize the research literature on a topic area can be important tools for advancing the state of knowledge in a field of inquiry. However, the appraisal of, and the distinction between, survey review and framework articles are often difficult because of the common focus on analyzing a substantial(More)
From literature data on 116 taxa crosses involving 46 species of frogs, we found a positive correlation between degree of divergence (measured as Nei's genetic distance, D) and degree of postzygotic isolation. In anurans, hybrid sterility appears to evolve more quickly than inviability, which is consistent with the conclusions of other studies that involved(More)
Hybrid incompatibility (including sterility, lethality, and less extreme negative effects) interests evolutionary biologists because of its role in speciation as a reproductive isolating barrier. It also has unusual genetic properties, being mainly due to interactions between at least two genes. Recent studies have identified some of the interacting genes(More)
A general pattern of animal hybridization, known as Haldane's rule, is that the XY (ZW) sex is more severely affected in its viability or fertility than the XX (ZZ) sex. Recent evidence suggests that three different forces have shaped this pattern: (1) the X chromosome and autosomes are in greater disharmony in the XY sex; (2) evolution of hybrid male(More)
Natural populations often experience the weakening or removal of a source of selection that had been important in the maintenance of one or more traits. Here we refer to these situations as 'relaxed selection,' and review recent studies that explore the effects of such changes on traits in their ecological contexts. In a few systems, such as the loss of(More)
Postzygotic isolation between incipient species results from the accumulation of incompatibilities that arise as a consequence of genetic divergence. When phenotypes are determined by regulatory interactions, hybrid incompatibility can evolve even as a consequence of parallel adaptation in parental populations because interacting genes can produce the same(More)