Sökning: "Molecular Phylogeny"

Visar resultat 21 - 25 av 108 avhandlingar innehållade orden Molecular Phylogeny.

  1. 21. Next-generation Molecular Systematics and Evolution: insights into Medicago

    Författare :Filipe de Sousa; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; phylogeny; incomplete lineage sorting; paralogy; hybridisation; 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. 22. Phylogeny of Artiodactyla and Cetacea - based on mitochondrial genomes

    Författare :Björn M Ursing; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Genetics; mitochondrial genome; phylogeny; Artiodactyla; Cetacea; cytogenetics; Genetik; cytogenetik;

    Sammanfattning : Artiodactyla (eved-toed ungulates) and Cetacea (whales) are two mammalian orders that are commonly recognised as sistergroups. Recently it has been suggested that Cetacea originated within Artiodactyla, but the relationships among the different artiodactyl lineages and Cetacea have not been conclusively established. LÄS MER

  4. 23. Molecules and morphology in Empidoidea (Diptera) : Phylogenetic analysis and taxonomical implications

    Författare :Emma Wahlberg; Kjell Arne Johanson; Thomas Pape; Jeffrey Cumming; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Empidoidea; Empididae; Hybotidae; phylogeny; taxonomy; systematics; molecular data; morphology; revision; Systematic Zoology; zoologisk systematik och evolutionsforskning;

    Sammanfattning : The classification and evolutionary history of the superfamily Empidoidea (Diptera) have been far from straightforward subjects. Morphology based phylogenies of the superfamily have been unable to answer many questions raised by both systematists and biogeographers, as well as ecologists and ethologists, partly due to morphological modifications and adaptations difficult to interpret. LÄS MER

  5. 24. Geographic and genetic diversity of hepatitis B

    Författare :Erik Alestig; Göteborgs universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; hepatitis B virus; genotype; phylogeny; molecular epidemiology; sequence analysis; mutation;

    Sammanfattning : Hepatitis B Virus (HBV) infection is a global health problem and may lead to chronic hepatitis, liver cirrhosis and hepatocellular cancer. The ability of HBV to adapt to the host environment by genetic variation has lead to the evolution of 8 established (A-H) and 2 putative genotypes (I-J), each corresponding to a rather well-defined geographical distribution. LÄS MER

  7. 25. Hidden Creatures – systematics of the Euphorinae (Hymenoptera)

    Författare :Julia Stigenberg; Fredrik Ronquist; Johannes Bergsten; Andrew Austin; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Parasitic wasps; Braconidae; Euphorinae; systematics; phylogeny; molecular taxonomy; cryptic species; evolution; host preferences; identification keys; Systematic Zoology; zoologisk systematik och evolutionsforskning;

    Sammanfattning : Parasitic wasps constitute one of the last remaining frontiers in the charting of animal diversity. The Braconidae is the second most species-rich family of parasitic wasps; the world fauna has been estimated at 40 000 species and the Swedish fauna is believed to include a little more than 2 000 species, 1 200 of which are currently documented. LÄS MER