Search for dissertations about: "sexual reproduction"

Showing result 16 - 20 of 107 swedish dissertations containing the words sexual reproduction.

  2. 16. Sexual conflict, sexual selection, and genetic variance in fitness

    Author : Karl Grieshop; Göran Arnqvist; David Berger; Jacek Radwan; Uppsala universitet; []
    Keywords : Biologi med inriktning mot zooekologi; Biology with specialization in Animal Ecology;

    Abstract : Understanding sex-specific genetic variance for fitness is of fundamental importance to our understanding of evolution. This thesis presents the findings of empirical investigations into sex-specific genetic variance in fitness. READ MORE

  4. 17. The balance between sex and asex: evolutionary genetic studies of reproductive variation in Allium vineale

    Author : Alf Ceplitis; Biologiska institutionen; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; ontogeny; growth animal ; Allium vineale; Development biology; evolution; sexual reproduction; reproductive systems; embryology; Utvecklingsbiologi; ontogeni; embryologi; Genetics; cytogenetics; Genetik; cytogenetik;

    Abstract : Evolutionary theory predicts a disadvantage to sexual reproduction. This manifests itself either by the higher growth rate of asexual females in a dioecious species, or by the higher transmission rate of a gene conferring asexual female function to its carriers in a hermaphrodite species. READ MORE

  5. 18. Effects of octylphenol on sexual development and reproduction in zebrafish

    Author : Shaima A. M. Mahgiubi; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Abstract : Anthropogenic chemicals released into the aquatic environment can disrupt the normal function(s) of an organism's endocrine system and thereby adversely affect reproduction and development. This has led to the development of robust fish tests to detect and assess endocrine active chemicals. READ MORE

  6. 19. Assessing environmental and contaminant stressors in a benthic amphipod

    Author : Therese Jacobson; Brita Sundelin; Tamara Galloway; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Multiple stressors; Reproduction; Temperature; Food; Parasites; Fenarimol; PFOS; TBT; Endocrine disruption; Ecdysteroids; Microsporidia; Microcosm; Crustacea; Amhipoda; Monoporeia affinis; Biology; Biologi; Applied Environmental Science; tillämpad miljövetenskap;

    Abstract : Organisms in the aquatic environment encounter numerous stressors throughout their lifespan. Some of them are biotic such as food availability, predators and parasites. Others are abiotic and include shifting salinity and temperature change among others. READ MORE

  7. 20. Polyandry and the evolution of reproductive divergence in insects

    Author : Tina Nilsson; Göran Arnqvist; David Hosken; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Ecology; Bruchidae; cryptic female choice; multiple mating; sexual conflict; sexually antagonistic coevolution; sexual selection; speciation; sperm competition; Tenebrionidae; Ekologi; Terrestrial; freshwater and marine ecology; Terrestisk; limnisk och marin ekologi;

    Abstract : Multiple mating by females is common in nature. Yet, the evolution and maintenance of polyandry remains a bit of an evolutionary puzzle. It was my aim in this thesis to reach a greater understanding of this phenomenon as well as to investigate the consequences of polyandry on the evolution of reproductive divergence in insects. READ MORE