Search for dissertations about: "Reproductive Incompatibility"

Showing result 1 - 5 of 8 swedish dissertations containing the words Reproductive Incompatibility.

2. 1. Genomic and transcriptomic investigation of reproductive incompatibility in Drosophila

   Author : Guilherme Costa Baião; Lisa Klasson; Alistair Darby; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Wolbachia; Drosophila; Drosophila paulistorum; Differential Gene Expression; Reproductive Incompatibility; Reproductive Isolation; Comparative Genomics; Transcriptomics; RNA-Seq; Heteroplasmy; Mitochondria; Genomic conflict; Biologi med inriktning mot molekylär evolution; Biology with specialization in Molecular Evolution;

   Abstract : Both nuclear and cytoplasmic elements can contribute to the emergence of reproductive incompatibilities that influence evolution and speciation. In the projects that compose this thesis, we use genomics and transcriptomics to study some of those elements in Drosophila. READ MORE

4. 2. Breeding System Evolution and Pollination Success in the Wind-Pollinated Herb Plantago maritima

   Author : Emil Nilsson; Jon Ågren; Pia Mutikainen; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biology; Breeding system; mating system; gynodioecy; male sterility; reproductive output; self-compatibility; self-incompatibility; wind-pollination; founder event; genetic structure; Biologi; Biology; Biologi; ekologisk botanik; Ecological Botany;

   Abstract : In this thesis, I examined variation in sex expression and mating patterns in the sexually polymorphic, wind-pollinated herb Plantago maritima. With a combination of field studies, greenhouse experiments, and genetic analyses, I (a) examined factors influencing sex ratio variation in gynodioecious plants (in which hermaphrodites and females coexist), (b) discovered variation in breeding system, (c) investigated density-dependence of seed production, and (d) documented genetic variation within and among populations close to the northern range margin in Europe. READ MORE

5. 3. Drivers of evolutionary change in Podospora anserina

   Author : Sandra Lorena Ament-Velásquez; Hanna Johannesson; Bengt Olle Bengtsson; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Podospora; Meiotic drive; Spore killing; vegetative incompatibility; heterokaryon incompatibility; allorecognition; speciation; Transposable elements; selfish genetic elements; fungi; Biology with specialization in Evolutionary Genetics; Biologi med inriktning mot evolutionär genetik;

   Abstract : Genomic diversity is shaped by a myriad of forces acting in different directions. Some genes work in concert with the interests of the organism, often shaped by natural selection, while others follow their own interests. The latter genes are considered “selfish”, behaving either neutrally to the host, or causing it harm. READ MORE

6. 4. On the Evolution of Reproductive Systems in Neurospora

   Author : Rebecka Strandberg; Hanna Johannesson; Paul Dyer; Uppsala universitet; []
   Keywords : Neurospora; mating type; pheromone receptor; phylogeny; gene expression; heterothallism; homothallism; pseudohomothallism; alternative splicing; Biology with specialization in Evolutionary Genetics; Biologi med inriktning mot evolutionär genetik;

   Abstract : The aim of this thesis was to study the evolution of reproductive systems and reproductive traits in the fungal genus Neurospora. More specifically, I have investigated the evolutionary forces shaping the genes involved in sexual reproduction, focusing on mating-type (mat) and pheromone receptor (pre) genes. READ MORE

7. 5. Evolution of Spur Length in a Moth-pollinated Orchid

   Author : Elin Boberg; Jon Ågren; W. Scott Armbruster; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Platanthera bifolia; floral evolution; natural selection; pollination; spur length; population differentiation; divergent selection; disruptive selection; reproductive isolation; Biology; Biologi; Ecological Botany; Ekologisk botanik;

   Abstract : There is considerable evidence that pollinator shifts can explain many differences in flower morphology between closely related plant species, but the extent to which pollinator shifts can explain the maintenance of among-population variation in floral traits within species is poorly known. In this thesis, I combined comparative and experimental approaches to examine the evolution of floral traits in the moth-pollinated orchid Platanthera bifolia. READ MORE