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 “"Nucleotide Diversity"”.
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Spatial and non-spatial patterns of genetic diversity in Neotropical bats
<p>Macroecological studies that predict genetic diversity and its correlation with other biodiversity dimensions are essential to conservation in a rapidly changing environment. However, in bats (order Chiroptera), studies associating abiotic or ecological traits that could help to predict genetic …
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Molecular phylogeographic structure within the Perognathus fasciatus species-group
… of Perognathus. MtDNA sequence divergence and nucleotide diversity are much higher within populations of P. apache than within P. flavescens. While this difference could be attributed to a higher rate of mtDNA lineage divergence in P. apache, a more likely explanation is that the high …
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How Linkage Disequilibrium and Recombination Shape Genetic Variation Within and Between Species
<p>Meiotic recombination creates genetic diversity by shuffling combinations of alleles across loci, yet alleles at neighboring loci often remain non-randomly associated. This non-random association is known as linkage-disequilibrium (LD), and it has evolutionarily important effects both within and …
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Natural Selection on S-Linked Genes in Turnera (Passifloracease)
… selection at the S-locus in Turnera, average nucleotide diversity and sequence polymorphism measures were found to be elevated in two S-linked genes (AP2D and RNABP), suggesting the possible occurrence of balancing selection at these or closely-linked loci. Limited trans-species polymorphisms …
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Phylogeography of Darlingtonea Kentuckensis and Molecular Systematics of Kentucky Cave Trechines
… analysis of molecular variance found low nucleotide diversity within populations and statistically significant variation among geographically-defined groups tested based on two a priori hypotheses of structure. Population structure among five distinct genetic clusters identifies …
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Mitochondrial DNA sequence variation in North Atlantic long-finned pilot whales, Globicephala melas
… pilot whale sequences by 2.75 - 3.50%. D-loop nucleotide diversity in long-finned pilot whales was 0.03% and in short-finned pilot whales was 0.05%. The cytochrome b gene sequences determined for 16 long-finned pilot whales from all sampled locations, 4 Atlantic short-finned pilot whales, and …
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The Effect of Population History on Hominoid Intraspecific Cranial Shape Diversity: Combining Population Genetic and 3D Geometric Morphometric Data
<p>Cranial shape diversity within hominoids has been previously studied with the aim of understanding how levels of diversity in extant species compare with extinct hominin specimens. This dissertation addresses the question of why cranial shape diversity differs among extant hominoids. Levels of …
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Dissecting the evolutionary forces shaping sex chromosome evolution in papaya
… Rica. The papaya Y chromosomes have a higher diversity than the autosome, contrasting other young chromosome systems. The autosomal regions and male Y chromosome are evolving neutrally, but the HSY is experiencing strong positive selection due to a selective sweep during human domestication. …
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TNFRSF13B Genetic variability an anthropological - evolutionary approach to Biomedical Research
… achievement of a global picture of TNFRSF13B nucleotide diversity and haplotype structure and making suggestion of its evolutionary history possible. A slow rate of evolution, within our species and when compared to the chimpanzee, low levels of genetic diversity geographical structure and the …
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Contributions of Structural and Non-structural Genes to the Attenuation of the 17D Vaccine
… the non-structural (NS) protein genes, and four nucleotide changes in the 3’ non-coding region. The NS proteins are required for viral replication and modulate the host immune response. The hypothesis to be tested in this dissertation is to determine whether or not structural and non-structural …
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Hard-wired for success? Unravelling genomic signatures in pollinators
… of the genome detecting a strikingly low nucleotide diversity compared to other bumblebees, as well as signatures of directional selection in developmental biology genes.<br/>
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Genetic variation in fast-evolving East African cichlid fishes: an evolutionary perspective
… properties of the genome were characterized. Nucleotide diversity of Malawi cichlids was low at 0.26%, and a sample genotyping study found that biallelic polymorphisms segregate widely throughout the Malawi species flock, making each species a mosaic of ancestrally polymorphic genomes. A …
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Historical Genetic Analysis Of Horned Lark (Eremophila Alpestris) Specimens From The Prairie Pothole Region
… the North Dakota region population had higher nucleotide diversity than other populations, and were all part of the Nearctic Northern clade. Five new haplotypes and three new SNPs were identified from museum specimens in this study.</p>
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GENETIC DIVERSITY AND LINKAGE DISEQUILIBRIUM IN WILD SOYBEAN, LANDRACES, ANCESTRAL, AND ELITE SOYBEAN POPULATIONS
… can impact populations by reducing genome diversity and increasing the extent of linkage disequilibrium (LD). To understand the impact of these genetic bottlenecks and selection on sequence diversity and LD within soybean [Glycine max (L.) Merr.], 111 genes and three chromosomal regions …
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Investigating the genetic diversity, population structure and archaic admixture history in worldwide human populations using high-coverage genomes
… (>30x) genomes from the Human Genome Diversity Project (HGDP) panel, a collection of cell lines from 54 populations across the world. Some data processing steps were necessary for downstream analysis, including lifting over resources on a different reference genome assembly, annotating …
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Molecular characterization of three mental illness susceptibility genes
… with increased NRG1 type III expression and high nucleotide diversity in an Australian cohort (Chapter 3). In addition, several novel splice isoforms of ST8SIA2 were identified that could have a significant role in determining the functions of this candidate gene (Chapter 5). Analysis of protein …
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Characterisation of badnavirus sequences in West African yams (Dioscorea spp.)
… This study was to determine the prevalence and diversity of yam badnaviruses, as well as determine if badnavirus sequences are also integrated in the genomes of West African yam breeding lines. DNAs were extracted from Nigerian yam leaf samples (177 breeding lines, 78 landraces), using an …
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Associations between MHC class I variation and blood pathogen prevalence in caracal
… and bacteria, and the high levels of genetic diversity reported at these loci is thought to be primarily the result of pathogen-mediated selection. Although variation within a number of MHC genes has been described in many felid species, the relationship between MHC diversity and pathogen …
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Genetic admixture of Kruger National Park black rhino (Diceros bicornis minor): conservation implications
… new populations whilst maintaining genetic diversity and promoting gene flow between existing isolated populations. Such objectives are however currently hindered by a lack of comparative/reference data on levels of diversity, relatedness and inbreeding in a large, free-ranging black …
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Genetic variation among Zulu sheep sub-populations of South Africa assessed by microsatellites and mitochondrial DNA (mtDNA)
… mitochondrial DNA) to investigate the genetic diversity of Zulu sheep. In experiment 1, 26 microsatellite markers were used; (i) to confirm or disconfirm the structuration among eight Zulu sheep populations (Eshowe, Jozini, Makhathini research station, Mtubatuba, Nongoma, Nquthu, Ulundi, …
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