Sökning: "chromosome"

Visar resultat 21 - 25 av 803 avhandlingar innehållade ordet chromosome.

  1. 21. Sex Chromosome Evolution in a Hermaphrodite : Genetic and phenotypic relationships between sex roles

    Författare :Anna Nordén; Evolutionär ekologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Sex chromosome evolution; Hermaphrodite; Inter-sexual genetic correlation; Quantitative genetics; Macrostomum lignano; Experimental evolution; Sexual conflict;

    Sammanfattning : Sex chromosome evolution in a hermaphrodite ancestor starts with the establishment of a sex-determining region (SDR). Over time, sex-specific genes, and/or sexually antagonistic alleles will become linked to the SDR. LÄS MER

  3. 22. Cryptic chromosome abnormalities in idiopathic mental retardation

    Författare :Britt-Marie Anderlid; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Mental retardation is a common disorder, affecting 1-3% of the population. In spite of improved diagnostic tools, the etiology can still not be established in half of the cases. Several lines of evidence indicate a genetic origin in a significant number of individuals with idiopathic mental retardation. LÄS MER

  4. 23. Chromosome synapsis and recombination in yeast meiosis

    Författare :Hasanuzzaman Bhuiyan; Karin Schmekel; Harry Scherthan; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; meiosis; recombination; synapsis; yeast; Molecular biology; Molekylärbiologi;

    Sammanfattning : Meiosis is a cell division process that produces haploid gametes from diploid cells. Several important meiotic events take place during prophase of meiosis I, most important being homologous chromosome pairing, meiotic recombination and formation of the synaptonemal complex (SC). LÄS MER

  5. 24. Chromosome aberrations and environmental exposures in acute leukemia

    Författare :Ragnhild Rosengren Lindquist; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Acute leukemia; chromosome 3; chromosome 8; fragile site; occupational exposure; mutagen exposure; case-control study; trisomy; benzene; organic solvent; petroleum; epidemiology; environmental carcinogens; painter; driver;

    Sammanfattning : The aims of this thesis are to evaluate the role of environmental exposures, especially professional exposure to organic solvents and petroleum products in the etiology of acute leukemia and to investigate if there is a correlation between the exposure to a specific leukemogen factor and a clonal chromosome aberration of the leukemic cells. Papers I and II present results of a case-control study of environmental exposures, in all occupations during life-time, medical treatments with medicines, chemotherapy and radiation, tobacco-use and the exposure to chemical compounds in private life in 120 patients with acute leukemia and of 120 controls, matched for age (+ 4 years), residence and sex. LÄS MER

  7. 25. Chromosome-wide gene regulatory mechanisms in Drosophila melanogaster

    Författare :Anna-Mia Johansson; Jan Larsson; Kristen M. Johansen; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chromatin structure; Drosophila; POF; disage compensation; gene expression; MSL; heterochromatin; Genetics; Genetik; genetik; Genetics;

    Sammanfattning : In Drosophila there are two different chromosome-wide targeting systems, the dosage compensation system that equalizes the transcriptional output from X-linked genes between males and females, and the regulation of the 4th chromosome mediated by the POF protein.   The best studied of these two mechanisms is the dosage compensation system. LÄS MER