Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 6 of 6 for “"postzygotic isolation"”.
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The genetics of species differences within the genus Nasonia ASHMEAD 1904 (Hymenoptera: Pteromalidae)
… supposed to be frequently involved in prezygotic isolation, i.e. they prevent the formation of hybrids, whereas postzygotic isolation occurs when hybrids experience a fitness reduction. The parasitic wasp genus Nasonia represents an appropriate model system to investigate the genetics of species …
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Chromosomal inversions as a mechanism for sympatric differentiation in common quails
… local adaptation and early reproductive isolation, but their effects in highly mobile species remain poorly understood. In the common quail Coturnix coturnix, a large inversion on chromosome 1 spans about 12% of the genome and defines three karyotypes (AA, AB, BB) that differ in …
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Behavioral and genomic patterns of evolution during speciation via reproductive and agonistic character displacement
… of sympatry compared to allopatry. Behavioral isolation can potentially evolve among populations within a species as a correlated effect of RCD or ACD, termed cascade RCD (CRCD) or cascade ACD (CACD). My dissertation research integrated behavioral and genomic approaches to investigate the role …
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Speciation and the evolution of male breeding coloration in darters
… mechanisms of sexual selection and reproductive isolation in two closely related, ecologically and behaviorally similar species: the rainbow darter (Etheostoma caeruleum) and the orangethroat darter (E. spectabile). First, I quantified variation in male breeding coloration across multiple …
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Cellular/Molecular Analysis of Interspecies Sterile Male Hybrids In Drosophila
… on Earth. Interspecies hybrid sterility is a postzygotic isolating mechanism that affects the development of hybrids, rendering them sterile. A notable trend, known as Haldane's Rule, describes that heterogametic individual (e.g. males in Drosophila) are more susceptible to sterility than …
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A test of the Snowball model
… unlike simple ones, do snowball. Reproductive isolation, however, does not snowball because DMIs do not act independently of each other. I also test the snowball model at the population level using an individual-based model. Using this model, I show that recombination rate, gene flow, and …