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 20 of 20 for “"evo-devo"”.
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Colouration evo-devo: the developmental basis of intra-specific variation in cichlid pigmentation
… and how organisms diversify is a major goal of evolutionary biology. The fields of evolutionary developmental biology, evolutionary ecology, and population genetics have taken complementary approaches to this task, yet a lack of integration between these fields limits our understanding of the …
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KEY DEVELOPMENTAL EVENTS IN THE ORIBATID MITE, ARCHEGOZETES LONGISETOSUS, AND THE EVOLUTION OF CHELICERATE BODY PLANS.
… spiders and the pectines of scorpions). Recent evolutionary developmental (evo devo) studies on arachnids and other arthropods have shown that a conserved suite of developmental genes pattern the chelicerate body plan, with slight modifications in their expression patterns correlating with …
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Unraveling The Molecular Mechanisms Of Insect Diversity
… the recent merger between the fields of evolutionary and developmental biology ("evo-devo") have provided several examples illustrating that this extraordinary diversification may be due to evolved variation(s) in the developmental networks that control the formation of these structures. …
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Cretaceous Amber: A New Source of Bird Remains and of Palaeoecological Information in Dinosaur Bonebeds
… previously. These results allow us to refine our evolutionary-developmental (evo-devo) models for integumentary structures in dinosaurs by providing additional data on structures preceding modern feathers. The structural features observed support a particular pathway for evolutionary development …
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Funktionsanalyse der Entwicklungskontrollgene Irx2 und Mash1 in der Maus.
… Fehlfunktion und der gestörten Stimmbildung. Die Evo-Devo-Studien aus Drosophila und Xenopus verweisen auf eine Interaktion der Iroquois-Gene mit den Mitgliedern des achaete-scute-Komplexes. Eine direkte Regulation konnte für die orthologen Gene - Irx2 und Mash1 - in der Maus nicht bestätigt …
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Early land plant origins of the MYB-bHLH-WDR complex
A major aim in the field of evolutionary developmental biology (evo-devo) is to identify the mechanisms by which developmental novelties arise. The observation that incited the present study was the identification of a common theme across the differentiation of multiple specialised cell types in …
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Comparative Physiological and Genomic Analyses of Division of Labor in Honey Bees and Paper Wasps
… aimed at understanding the mechanisms and evolution of sociality in colony-forming insects. I first summarize a conceptual framework for the study of social behavior inspired by the field of evolutionary developmental biology (""evo-devo""); I suggest complex social behavior evolves via …
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Molecular Epigenetics in Evolution and Development
The dominantly held view in evolutionary theory focuses on gradual or punctuated change, primarily via natural selection, as the mechanism by which novel traits arise and evolution occurs. Noticeably absent from this portrayal of evolution is mention of the conservation of general characteristics, …
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Transcriptional divergence during cichlid embryogenesis
Cichlid fishes have undergone rapid speciation, making them one of the largest vertebrate families and among the most striking examples of adaptive radiation. Cichlid research has largely focused on diverging phenotypes of adults despite many of these variable traits likely being established during …
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You Should Look a Gifted Mammal in the Mouth: Using Dental Morphology to Understand the Evolution of Mammalian Dentition
… is vital to our understanding of mammalian evolution. In this thesis, I use dental morphology as a basis for investigating various phenomena in mammalian dentition. First, I investigate the utility of shape, form, and linear measurement when differentiating species of the genus Mesodma – …
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Comparative functional analysis of the atypical Notch ligands DLK1 and DLK2 in vertebrate development
DLK1 and DLK2 are vertebrate specific non-canonical Notch ligands. Dlk1 is imprinted throughout murine development [76] but selectively loses its imprint in the postnatal neurogenic niche by an unknown mechanism [78]. Possessing both secreted and membrane-tethered isoforms[212, 211], DLK1 plays …
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The Evolution and Development of Nectar Spurs
Nectar spurs (tubular outgrowths of a floral organ which contain or give the appearance of containing nectar) are hypothesized to be a ‘key innovation’ which can lead to rapid speciation within a lineage, because they are involved in pollinator specificity. However, given that there are no …
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Role of KNOX genes in the evolution and development of floral nectar spurs
… or regulation produce new morphologies during evolution. The nectar spur is an evolutionarily labile structure known to influence speciation in a broad range of angiosperm taxa. Here, the genetic basis of nectar spur development, and the evolution of differences in nectar spur morphology, is …
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The mechanisms underlying convergent evolution in the plumage patterns of birds
Convergent evolution is a central theme in biology. Birds are an ideal system to examine the mechanisms underlying convergent evolution. Although bird patterning is diverse, within-feather patterns have repeatedly converged on the same four types: mottled patterns, scales, bars and spots. Other …
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Comparative studies of brain developmental timing and progression using 3D stem cell models
… is three times larger than those of our closest evolutionary relatives such as chimpanzees and gorillas, yet the mechanisms by which this increase in size has been achieved, and also the implications of this on human brain function and capabilities, remain largely yet to be elucidated. However, …
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Cross-species single-cell transcriptomics and its applications in evolutionary and translational research
… This opens up new possibilities to study the evolution of cell types and infer molecular properties of organisms inaccessible to experimental research. In this thesis, I explore these two applications in the context of early mammalian development and vertebrate brain evolution. I first detail …
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Molecular Studies on Head Development of the Amphipod Crustacean Parhyale hawaiensis
… Tracheenplakoden bei Insekten auf eine mögliche evolutionäre Verbindung dieser Strukturen hin. Auch mehrere zusätzliche Homöoboxgene der paired-Klasse mit vermutlich konservierten Funktionen in der Kopfentwicklung wurden in dieser Arbeit untersucht. Betrachtet man deren Expressionsmuster, so …
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The evolution of somitogenesis: Mechanisms of paraxial mesoderm elongation in zebrafish and other vertebrates
… the process of paraxial mesoderm elongation have evolved differently across vertebrate lineages, resulting in a spectrum of elongation strategies.
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Appendage development and early Distal-less regulation in arthropods: A study of the chelicerate Tetranychus urticae (Acarida)
A major goal of evolutionary developmental biology is to explore mechanisms and events underlying evolution of the myriad body plan morphologies expressed both genetically and phenotypically within the animal kingdom. Arthropods exhibit an astounding array of morphological diversity both within and …
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Petal cell shape and flower-pollinator interaction in Nicotiana
… project aims to further understand character evolution of petal cell shape in Nicotiana and its implications in pollination systems, combining tools of molecular biology, morphology and pollinator behaviour experiments. First, using a candidate gene approach, I explore in parallel the …