Sökning: "sexual reproduction"

Visar resultat 1 - 5 av 116 avhandlingar innehållade orden sexual reproduction.

  1. 1. Modelling Sexual Interactions : Sexual behaviour and the spread of sexually transmitted infections on dynamic networks

    Författare :Disa Hansson; Tom Britton; Fredrik Liljeros; KaYin Leung; Janneke Heijne; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Mathematical modelling; Sexually transmitted infections; Egocentric network analysis; Dynamic networks; Sexual behaviour; HIV; Statistical inference; Mathematical Statistics; matematisk statistik;

    Sammanfattning : In this thesis we develop statistical and mathematical models to study different factors of relevance for the spread of sexually transmitted infections (STIs). Two special interest groups for STI interventions are considered: sexually active youths and men who have sex with men (MSM). LÄS MER

  3. 2. Konstruktioner av den sexuella familjen : styrning av föräldrablivande i rättslig reglering av assisterad befruktning och juridiskt föräldraskap

    Författare :Elin Jonsson; Lena Wennberg; Monica Burman; Leila Brännström; Umeå universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Legal parenthood; parentage; Children and Parents Code; Genetic Integrity Act; assisted reproduction; the sexual family; Swedish family law; discourses in law; parental status; Law; juridik;

    Sammanfattning : This doctoral thesis deals with the Swedish legal regulation of becoming a parent. It covers the regulation of legal parental status and of health care-provided assisted reproduction. LÄS MER

  4. 3. Sexual Conflict and Gene Expression in Drosophila melanogaster

    Författare :Paolo Innocenti; Edward Morrow; Göran Arnqvist; Andrew G Clark; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Sexual conflict; sexual selection; male-female coevolution; gene expression; transcriptome; microarrays; sexual dimorphism; Drosophila; Biology; Biologi; Biologi med inriktning mot zooekologi; Biology with specialization in Animal Ecology; Biology with specialization in Evolutionary Genetics; Biologi med inriktning mot evolutionär genetik;

    Sammanfattning : Sexual conflict is broadly defined as a conflict between the evolutionary interests of the two sexes. Depending on the genetic architecture of the traits involved, it can occur at the level of male-female interactions or take the form of selection acting to change the mean of a shared trait against the sign of its genetic correlation. LÄS MER

  5. 4. Genetic variation and sexual reproduction in a moss with dwarf males, Homalothecium lutescens

    Författare :Frida Rosengren; Biodiversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; bryophytes; mosses; dwarf males; sexual reproduction; genetic variation; genetic structure; inbreeding; isozymes; allozymes; SNP; sporophytes; spore; fertilization; fertility;

    Sammanfattning : Dwarf males occur in many unrelated groups of organisms. Among land plants they are unique to mosses. Moss dwarf males originate from male spores that land and germinate on the female where their final size is restricted to a few mm. Fertilization in mosses occur over short distances with swimming spermatozoids. LÄS MER

  7. 5. Sexual Selection and Adaptation to Novel Environments

    Författare :Ivain Martinossi-Allibert; David Berger; Göran Arnqvist; Lukas Schärer; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Sexual selection; Environmental change; Sexual conflict; Environmental stress; Adaptation; Adaptive landscape; Biologi med inriktning mot zooekologi; Biology with specialization in Animal Ecology;

    Sammanfattning : The work included in this thesis aims at exploring the environmental sensitivity of benefits and costs of sexual selection through a combined empirical and theoretical effort, to increase our understanding of the impact of environmental change on sexually reproducing populations.Can sexual selection promote adaptation to novel environments? Sexual selection for good genes should accelerate adaptation by granting higher reproductive success to individuals of high genetic quality. LÄS MER