Sökning: "lineage sorting"
Visar resultat 1 - 5 av 17 avhandlingar innehållade orden lineage sorting.
1. Disentangling the Reticulate History of Polyploids in Silene (Caryophyllaceae)
Sammanfattning : DNA sequences from the rps16 intron and the psbE-petL spacer from the chloroplast genome, the ribosomal nuclear ITS region, and introns from the low copy nuclear genes RPA2, RPB2, RPD2a and RPD2b, are in different combinations used to infer phylogenetic relationships in Sileneae (Caryophyllaceae). Used in concert, the biparentally inherited nuclear regions are useful to distinguish between paralogy due to allopolyploidy and single gene duplications, respectively, because the latter are not expected to give rise to repeated phylogenetic patterns in potentially unlinked sequence regions. LÄS MER
2. Next-generation Molecular Systematics and Evolution: insights into Medicago
Sammanfattning : Evolutionary relationships among species have in recent years been inferred using DNA sequences from specific genes and represented by tree diagrams (phylogenies). However, the signal contained in different genes can produce conflicting sets of relationships – i.e., gene tree incongruence. LÄS MER
3. Phylogeny and topological incongruence in the Rubioideae (Rubiaceae)
Sammanfattning : The work with this thesis has focused on evolutionary relationships in the Rubioideae, the most species-rich subfamily of the large and diverse coffee family (Rubiaceae). Despite considerable efforts during the last decades, uncertainty regarding several relationships in this group has remained, either as a result of unconvincing statistic support, incongruent results, or insufficient taxon sampling. LÄS MER
4. Investigations of Hematopoietic Stem Cells and Their Age-Associated Alterations
Sammanfattning : The hematopoietic stem cell (HSC) has and continues to be extensively investigated, and represents by far the most studied somatic stem cell. Development of various experimental technologies, including fluorescence activated cell sorting (FACS), have been crucial for research advancements within the hematopoietic field. LÄS MER
5. Locus specific DNA methylation in human immunological responses
Sammanfattning : All cells in the human body contains the same genome. Yet, there are hundreds of different cell types, with widely different phenotype, and function. The differential gene expression leading to this diversity is tightly regulated by epigenetics, i.e. LÄS MER