Sökning: "Sex chromosomes"

Visar resultat 1 - 5 av 52 avhandlingar innehållade orden Sex chromosomes.

  1. 1. Mutation and Diversity in Avian Sex Chromosomes

    Författare :Hannah Sundström; Hans Ellegren; David W. Burt; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Genetics; mutation rate; diversity; sex chromosomes; indels; male bias; selective sweep; effective population size; birds; Genetik; Clinical genetics; Klinisk genetik;

    Sammanfattning : Sex chromosomes are useful for the study of how factors such as mutation, selection, recombination and effective population size affect diversity and divergence.A comparison of gametologous introns in seven different bird species revealed a complete lack of diversity on the female-specific W chromosome. LÄS MER

  3. 2. The evolution of sex chromosomes and sex-linked sequences in birds

    Författare :Homa Papoli Yazdi; Hans Professor; Bengt Hansson; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; sex chromosomes; female heterogamety; recombination suppression; genetic map; inversions; genetic diversity; pseudoautosomal region; Biology with specialization in Evolutionary Genetics; Biologi med inriktning mot evolutionär genetik;

    Sammanfattning : Identifying the processes involved in the evolution of suppressed recombination between sex chromosomes and understanding their consequences for the evolutionary dynamics of sex-linked loci have been major topics of research during the last century. In this thesis, I used the avian ZW system, where females are the heterogametic sex, to investigate the underlying processes in sex chromosome evolution in birds. LÄS MER

  4. 3. Evolution of sex chromosomes in Sylvioidea songbirds

    Författare :Hanna Sigeman; MEMEG; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Sex chromosome; neo-sex chromosome; Birds; vertebrates; Genomics; Bioinformatics;

    Sammanfattning : Sex chromosomes were discovered more than 100 years ago. They have been studied intensely from a theoretical perspective since then, giving rise to a large body of testable predictions about their evolution from autosomes. LÄS MER

  5. 4. Ambivalent Ambiguity? : A study of how women with 'atypical' sex development make sense of female embodiment

    Författare :Lisa Guntram; Kristin Zeiler; Karin Zetterqvist-Nelson; Cynthia Kraus; Linköpings universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Sex; sex development; ‘atypical’ sex development; female embodiment; adolescence; women; Sweden; uterine and vaginal agenesis; Turner syndrome; intersex; DSD; qualitative methodologies; sense-making; narratives; norms; normality; heteronormativity; resistance; relations; sexual practice; diagnosis; treatment; critique; Kön; könsutveckling; kvinnlig kroppslighet; ”otypisk” könsutveckling; normalitet; tonår; kvinnor; Sverige; MRKH syndrom; uterus och vaginal agenesi; Turner syndrom; intersex; DSD; meningskapande; relationer; kvalitativ metod; narrativ; normalitet; heteronormativitet; sexuell praktik; normer; ifrågasättande; diagnos; behandling; kritik;

    Sammanfattning : Against a backdrop of feminist and social scientific research on sex, female embodiment, and normality this thesis aims to discern how young women, who in adolescence have learned that their bodies are developing in ways considered ‘atypical’ for the female sex, make sense of their bodies and their situation. In focus are the ways in which the women make sense of and negotiate female embodiment; how they, particularly in stories about their interactions with others, position their embodied selves; and how norms and beliefs about sexed embodiment, heterosexual practice, and in/fertility are strengthened and challenged in the interviewees’ sense-making. LÄS MER

  7. 5. Genetic Sex Differences in Early Human Neuronal Development : An Investigation in Embryo Tissue and Embryonic Stem Cells

    Författare :Philipp Pottmeier; Elena Jazin; Armin Raznahan; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; sex chromosome; gametolog; x y homolog; male; female; sex differences; sex bias; embryonic stem cells; neurodevelopment; neuronal differentiation; neural stem cells; genetics; neurodevelopmental disorders; Biology with specialization in Evolutionary Organismal Biology; Biologi med inriktning mot evolutionär organismbiologi; Neuroscience; Neurovetenskap; Medicinsk genetik; Medical Genetics;

    Sammanfattning : Sex differences in the human body affect many different organs and tissues, some of them have an effect on the human brain and its development. In the developing nervous system, sex differences can bias the number or functionality of neurons, glial cells or synapses. As a result, neural networks might develop with a sex-specific bias. LÄS MER