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 53 for “"genome size"”.
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Evolutionary dynamics of mechanisms that affect genome size in the cotton genus (Gossypium)
<p>Eukaryotic genomes vary remarkably in size even between closely related species. This variation reflects a balance between mechanisms that expand and contract genomes, and which vary in their magnitude during evolution. While much is known about mechanisms that affect genome size expansion, …
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Modelling evolution of genome size in prokaryotes in response to changes in their abiotic environment
The size of the genomes of known free-living prokaryotes varies from � 1:3 Mbp to � 13 Mbp. This thesis proposes a possible explanation of this variation due to variability of the physical conditions of the environment. In a stable environment, competition for the resource becomes the main force of …
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Evolutionary biology of the Armillaria mellea species complex
… strains, The NPH data and estimates of genome size (genetic complexity) was analyzed using a stoichiometric approach to calculate equivalents of homologous DNA and low copy repetition frequencies. Reciprocal NPH values did not predict relative genome size as expected, However, as the …
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Molecular phylogenetics, systematics, reproductive safeguarding and chromosome evolution of the genus Lachenalia (Asparagaceae: Scilloideae)
… used to explore the evolution of cytotype and genome size in Lachenalia. Novel genome size data for 124 species are reported and reconciled with existing karyotype data to show that genome size variation is largely a product of polyploidization, with polyploidy yielding lineages that are mostly …
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Haemobartonella Felis (Mycoplasma Haemofelis) Molecular Diagnostics and Genomic Studies
Little was known about the genome size or structure of the haemotrophic mycoplasmas and studies of pathogenicity, adhesion, and protein production are hampered by the inability to culture H. felis and use more common genetic tools. A renewable source of H. felis DNA in the form of a large insert …
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Molecular analysis of sex chromosome evolution in papaya
… a 4.6 Mb difference between the two sexes. Genome size differences have been detected between sexes in species with heteromorphic sex chromosomes using flow cytometry. I examined whether the 4.6 Mb difference between sexes can be detected using flow cytometry and tested whether a selection …
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Cytogenetics and genome structure in genus Miscanthus, a potential source of bioenergy feedstocks
… This study (chaper 2) combines information on genome size and ploidy levels and DNA sequence variation to classify Miscanthus accessions to aid potential biomass crop improvement programs and to investigate the evolution of the genus. We observed that Miscanthus accessions fell into 4 groups, …
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CBK Bacteriophage Genome Annotation and Organization
… phage CbK being the best studied. As no B3 phage genome sequences are currently available in the Genbank, we decided to determine the nucleotide sequence of the CBK genome. Bacteriophage CbK is a double-stranded DNA phage with an extremely large genome size of 203,242 base pairs and a 66.13% GC …
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Evolutionary Genomics of Dominant Bacterial and Archaeal Lineages in the Ocean
… marine microbial diversity and the evolution of genome architecture. In Chapter 2, I use a comparative framework to get insights into the evolutionary forces driving genome streamlining in the Ca. Marinimicrobia, a clade widely distributed in the ocean. This project shows that differences in the …
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Repetitive DNA sequences in maize: Possible roles in plant adaptation and transient gene expression
… this variation. Other DNA sequences involved in genome size variation due to adaptive response have yet to be identified. To isolate and identify such sequences, genomic DNA libraries were constructed from three maize lines adapted to different altitudes. The isolated clones were screened for …
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Probabilistic Modelling of Replication Fidelity in Eukaryotic Genomes
… that optimise complete DNA replication in genomes of different size scales (10 Megabases to 10 Gigabases), spanning the whole eukaryota. We show in yeasts (genome size ~10 Megabases) that the replication origins (sites on DNA where replication can be initiated) are biased towards equal …
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Identification of genes from the poxvirus of a parasitoid wasp
… haemocyte encapsulation response. The DlEPV genome has not yet been fully characterized. A total of nineteen genes have been identified (10 of known functions, 9 of unknown) and the expected genome size is 290—300 kilobase pairs (kbp). We subjected DlEPV DNA to sequencing and structural …
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The ecology and evolutionary history of the Deinococcaceae family
… the Deinococcus genus arises from its large pangenome. A high abundance of transposase genes and efficient homologous recombination mechanisms enhanced their genetic flexibility and enabled Deinococcus to survive in diverse habitats. Conversely, this ecologically advantageous trait forms a …
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Evolution of Pseudomonas aeruginosa in the Cystic Fibrosis Lung
… arises in part from a large and malleable genome that is rich in regulatory elements. Pseudomonas’ adaptive potential may also be increased by the activity of so-called mutator strains that have high background mutation rates. We sought to discover large- and fine-scale patterns of genomic …
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Evolution of Pseudomonas aeruginosa in the Cystic Fibrosis Lung
… arises in part from a large and malleable genome that is rich in regulatory elements. Pseudomonas’ adaptive potential may also be increased by the activity of so-called mutator strains that have high background mutation rates. We sought to discover large- and fine-scale patterns of genomic …
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Understanding the weedy Chenopodium complex in the north central states
… easily differentiated with the support of the genome size data. Samples of C. strictum had a 2C value of 2.0 pg, which was different than C. album (3.6 pg/2C). Chenopodium populations from North Central states were also tested with ITS markers, and DNA content values were also obtained from a …
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Morphology, Molecular Phylogeny and Genome content of Bothriochloa focusing on Australian taxa
… (trnT-F, rps16 intron and 3'trnK) of chloroplast genome phylogenetic were used in phylogenetic reconstruction, and chromosome counting as well as flow cytometry for chromosome number and genome size were conducted during the study. Phylogenetic trees were constructed using MP with NJ for …
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Graph-based genomic signatures
Genomes have both deterministic and random aspects, with the underlying DNA sequences exhibiting features at numerous scales, from codons to regions of conserved or divergent gene order. Genomic signatures work by capturing one or more such features efficiently into a compact mathematical …
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A cytogenetic map for the genomic studies of the West Nile Virus vector Culex tarsalis
… Nile Virus (WNV) in North America. Although the genome for this species was recently sequenced, the physical genome map has not developed. Unlike other Culex species, that have sex-determination locus on chromosome 1, the sex locus in Cx. tarsalis is located on chromosome 3, the longest …
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