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 29 for “"whole genome duplication"”.
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Understanding How Whole Genome Duplication in Plants Impacts Herbivore-plant Interactions
… One such prevalent change in plants is whole-genome duplication (WGD), or polyploidy, but we are still learning how WGD affects ecological interactions. In particular, studies of herbivory on polyploids have primarily focused on established polyploid plant populations. Although this …
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The Effects of Whole Genome Duplication on Functional Traits and Interactions With Arbuscular Mycorrhizal Fungi
<p>Whole genome duplication is one of the most pervasive forces driving plant evolution, yet modelling efforts on the establishment of polyploid plants have shown that early generation polyploids, or "neopolyploids", should experience high extinction rates due to a population demographic …
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The Effects Of Whole Genome Duplication On Functional Traits And Interactions With Arbuscular Mycorrhizal Fungi
<p>Whole genome duplication is one of the most pervasive forces driving plant evolution, yet modelling efforts on the establishment of polyploid plants have shown that early generation polyploids, or “neopolyploids”, should experience high extinction rates due to a population demographic …
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How much DNA is too much?
… in the amount of DNA that they contain, and whole genome duplication events explain much of this diversity. But, whole genome duplication typically obstructs the proliferation of cells in which it occurs. How cells survive and proliferate after DNA content is increased is unknown, and …
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SELECTIVE FORCES SHAPING DUPLICATE GENE EVOLUTION: INSIGHTS FROM STOCHASTIC MODELING AND PATTERNS OF RETENTION
The variation of genome content and structure across the tree of life is astounding and can provide clues to understand the process of evolution. Overall, this helps us understand the history of life and how organisms have fundamentally changed and adapted to their environments. Gene duplication is …
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Pseudoscorpion Systematics & Phylogenetics: Exploring the Effects of Accelerated Rates of Evolution on Both Ancient and Recent Diversification
… other arachnid orders, and evidence of a shared whole genome duplication event uniting pseudoscorpions with the arachnopulmonates. Despite 250 years of systematic attention, there is still a lot that we do not know about the evolutionary history of pseudoscorpions, including the basic …
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Molecular evolution following allopolyploidization in Gossypium
Whole genome duplication (polyploidy) is an important mechanism of speciation and generator of novel genetic and phenotypic diversity, particularly in plants. While over 400 polyploidy events have been identified throughout the angiosperm phylogeny, many crops also have a recent episode of whole …
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The Role of Carotenoid Cleavage Dioxygenase 4 in Flower Color of the Allopolyploid Brassica napus
… are formed by interspecific hybridization and whole genome duplication, with the resulting organism contains multiple distinct subgenomes in one nucleus. Subgenomic interactions result in massive genetic and epigenetic reconstruction, contributing to variable phenotypic traits noted in newly …
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Head and protocerebral patterning in the spider Parasteatoda tepidariorum
… Frizzled, and head patterning genes) following whole-genome duplication in arachnopulmonates. The improved taxonomic sampling provided further evidence for the ancestral arachnopulmonate whole genome duplication and allowed me to identify likely patterns of ohnolog retention and loss. …
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Determining the Fate of Hybridized Genomes in the Allopolyploid Brassica napus
… forms through interspecific hybridization and whole genome duplication. While allopolyploids may display increased vigor relative to their progenitors, they can also face challenges to fertility following hybridization. Genetic changes in allopolyploids result from recombination between the …
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On the structure and evolution of protein interaction networks
… an experiment to explore the effect of the whole genome duplication [KBL04] on the protein-protein interaction network of S. cerevisiae, allowing us to distinguish between cases of subfunctionalization and neofunctionalization.
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Construction and analysis of the miscanthus genespace
… grasses and candidate bioenergy crops. Both genomes create a challenge for variant discovery and genotyping because of their abundant repeats and the presence of a genome scale duplication with little subsequent divergence. In addition, the Miscanthus genome has high heterozygosity due to its …
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Investigating the roles of Hes and Sox genes during embryogenesis of the spider Parasteatoda tepidariorum
… and genetics, and which has experienced a whole genome duplication in its evolutionary history. I characterized the expression of four Hes-like genes and fifteen Sox genes in this species. Briefly, hairy and Sox21B-1 are expressed in prosoma as well as in the posterior segment addition zone …
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Investigating the role of gene duplication in the evolution and divergence of Arachnids
Gene duplication underlies the origin of novel genes with potential new functions that can contribute to organismal divergence. Relaxed selection on duplicates allows for the accumulation of mutations in coding and/or regulatory sequences of duplicated genes leading to subfunctionalization and/or …
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Analysis of phytochrome signaling pathways in Zea mays
… in response to different light conditions. The genome of Arabidopsis, a dicot, contains five members of the phytochrome family, phyA-phyE. In contrast, genomes of monocots sequenced so far contain only three members, phyA-phyC, although polyploids may have multiple homeologs of each. Studies in …
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Integrating bioinformatic approaches to promote crop resilience
… comparative transcriptomics, and 3) develop a genome assembly pipeline that can be deployed to rapidly assemble a more contiguous genome, unraveling previously hidden complexity, using Phytopthora capsici as a model. As a result, we have generated strategic guidelines for transcriptome assembly …
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Genotypes to Phenotypes: Genomic attributes that impact Genome-wide Associations in peanut (Arachis hypogaea. L).
… = 20 chromosomes) – soybean having undergone a whole genome duplication some 20 million years ago, and peanut approximately 10 thousand years ago. Peanut’s recent tetraploid origin, through a single hybridization event between two diploid progenitors, and the genetic bottleneck at the …
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Evolution Via Gene Duplication and Alternative Splicing In The Eukaryotic Ski7 and Hbs1 Genes
<p>Gene duplication and alternative splicing are both recognized as important drivers of proteomic diversity and innovation during evolution, but the evolutionary changes over long periods of time or the interrelations of the two processes has not been extensively studied. Here I study these …
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Molecular Systematics of <i>Isoëtes</i> (Isoëtaceae) in Eastern North America
… and fertile allopolyploids derived from whole genome duplication following primary hybridization. Phylogenies inferred from whole chloroplast genome DNA sequences using maximum-likelihood and Bayesian inference were fully resolved with high support. Ancestral state reconstruction of …
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CHARACTERIZATION OF THE EUKARYOTIC TRANSLATION INITIATION FACTOR 4E (eIF4E) FAMILY MEMBERS IN THE ZEBRAFISH (Danio rerio)
… Analysis of eIF4E sequences from the twenty fish genomes currently available, as well as those of echinoderm, tunicate and cephalocordate, has allowed a glimpse of the origins and evolution of the eIF4E family in vertebrates. All deuterostomes have one representative from each class of eIF4Es. …
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