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 10 of 10 for “"species divergence"”.
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Postnatal specialization of astrocyte regional heterogeneity in the mammalian brain and improved tools for studying glia
… is shaped by postnatal development in both species, with significant species divergence in astrocyte gene expression signatures (Chapter 3). In Chapter 4, we report multiplexed expansion revealing (multiExR), a technique that can be used to visualize 20 or more proteins at nanoscale …
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Variational Inference Using Approximate Likelihood Under the Coalescent With Recombination
… epidemiology, and other fields. The multispecies coalescent (MSC) model has been widely employed by phylogenetic algorithms to construct the species tree while accounting for incomplete lineage sorting (ILS). However, the no-recombination assumption of the MSC model has been questioned. To …
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The genomic basis of species barriers in Heliconius butterflies
… process of speciation. Hybridization between two species is often maladaptive and results in offspring with decreased fitness compared to the parental forms. Recently, with the development of molecular and genomic tools, it has become possible to understand how and when reproductive isolation …
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Bioluminescence in dinoflagellates – diversity, molecular phylogeny and field ecology
… to investigate the identity of bioluminescent species, the genetic basis, diversity and functional regulation of bioluminescence, and the distribution of marine bioluminescent dinoflagellate populations.<br/><br/>Using “universal” and taxon specific PCR primers designed to amplify the …
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Evolutionary Assembly of the Neotropical Montane Avifauna
… and extinction. Biodiversity patterns in species-rich tropical mountains vary along horizontal (barriers), and vertical (elevation) dimensions. In this dissertation, I set out to explore the interplay between historical and ecological mechanisms hypothesized to shape diversification of …
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A study of the influence of sperm surface proteins on the activity of avian spermatozoa In-vitro and In-vivo
… from several avian and mammalian species entered quail uterovaginal junction SSTs in-vitro, and turkey spermatozoa were found in chicken uterovaginal junction SSTs following uterovaginal junction but not intravaginal insemination, thus showing that the SSTs are not selective, and …
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Functional Sorting of Evolutionary Effects in Protein Domains
… rely on the availability of enough within-species polymorphism data and between-species divergence data. But for the comparatively more conservative protein domain data, the absence of enough variations makes these general methods incompetent. The other problem lies at the difficulty of …
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Comparative Population Genomics and Speciation of Snakes Across the North American Deserts
… by identifying regions that promote lineage divergence, addressing whether speciation has occurred with gene flow, and when extended to multiple taxa, addressing if the same patterns of speciation are shared across codistributed groups with different ecologies. Here I examine the comparative …