Sökning: "introgressive hybridization"

Hittade 3 avhandlingar innehållade orden introgressive hybridization.

  1. 1. Hybridization and Evolution in the Genus Pinus

    Författare :Baosheng Wang; Xiao-Ru Wang; Sally Aitken; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Adaptation; biogeography; coalescent simulation; cytoplasmic genome; demographic history; genetic diversity; hybridization; migration; Pinus; population structure; selection; speciation; evolutionär genetik; evolutionary genetics;

    Sammanfattning : Gene flow and hybridization are pervasive in nature, and can lead to different evolutionary outcomes. They can either accelerate divergence and promote speciation or reverse differentiation. The process of divergence and speciation are strongly influenced by both neutral and selective forces. LÄS MER

  3. 2. Evolution of Flowering Time in the Tetraploid Capsella bursa-pastoris (Brassicaceae)

    Författare :Tanja Slotte; Martin Lascoux; Ulf Lagercrantz; Juliette de Meaux; Uppsala universitet; []
    Nyckelord :Biology; flowering time; homoeolog; hybridization; introgression; microarray; multiple origins; polyploid; QTL; Biologi;

    Sammanfattning : Although polyploidy is believed to be a major source of evolutionary novelty, few studies have examined the genetic basis of phenotypic variation in wild polyploids. In this thesis I have studied the genetic basis of flowering time variation in the wild tetraploid crucifer Capsella bursa-pastoris, as well as the evolutionary history of this species. LÄS MER

  4. 3. On Speciation in Birds – Genomic Signatures across Space and Time

    Författare :Martin Stervander; MEMEG; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; colonization; islands; isolation; introgressive hybridization; sympatry; natural selection; bill morphology; coalescence-based analyses; DNA sequencing; birds; divergence; Speciation;

    Sammanfattning : The process of speciation is a cornerstone in evolutionary biology. In Darwin’s On the Origin of Species, he described how he imagined that a new species would evolve to fill an empty niche. This focus on ecology shifted with Mayr towards the importance of isolation, and for many decades the geographic modes of speciation were debated. LÄS MER