Log in

Relevant bibliographies by topics / Asexuel / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Asexuel.

Dissertations / Theses on the topic 'Asexuel'

Author: Grafiati

Published: 9 November 2024

Last updated: 31 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Asexuel.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

De, Ory Zoé. "Un non-désir qui dit son nom : enquête sur une auto-identification émergente, l'asexualité." Electronic Thesis or Diss., Paris, EHESS, 2024. http://www.theses.fr/2024EHES0048.

Full text

Abstract:

À la croisée de la sociologie de la « déviance », de la sociologie de la sexualité et du genre, et de la critique des sciences, cette thèse porte sur un groupe social émergent : les personnes qui s'identifient en tant qu'asexuelles. Venant compléter d'un A le sigle LGBTQIA (+), ces personnes revendiquent une absence de désir et/ou d'attirance sexuelle pour autrui. La recherche s'appuie principalement sur une enquête qualitative par entretiens. Ont été recueillis et analysés les discours, revendications et récits autobiographiques de personnes asexuelles auto-identifiées résidant en France, mil

APA, Harvard, Vancouver, ISO, and other styles

2

Ricci, Lorenzo. "A new model to study alternative developments : asexual propagation and regeneration in the basal chordate Botryllus schlosseri." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066683.

Full text

Abstract:

Chez l’ascidie coloniale Botryllus schlosseri, en plus de l’embryogénèse existent deux voies de développement aboutissant à la production de la même structure : l’organisme adulte ou zooide. Ces développements alternatifs ont lieu lors de processus biologiques distincts : le bourgeonnement palléal (BP) et le bourgeonnement vasculaire (BV). Le BP est un processus de multiplication asexuée présentant une ontogénèse stéréotypée. En revanche, le BV est un phénomène régénératif, induit dans les vaisseaux sanguins de la colonie par l’ablation de tous les zooides et bourgeons palléaux. Mes travaux de

APA, Harvard, Vancouver, ISO, and other styles

3

Puisay, Antoine. "La reproduction sexuée et asexuée des coraux face aux changements environnementaux : Implications pour la conservation et la restauration des récifs coralliens." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEP030.

Full text

Abstract:

Le changement climatique et l’augmentation des températures globales perturbent l’abondance et la distribution de milliers d’organismes, aquatiques et terrestres, et certains écosystèmes sont particulièrement sensibles à ces changements environnementaux. L’augmentation de température est la principale menace au maintien des populations de coraux, véritables ingénieurs écologiques de ces écosystèmes. Bien que la recherche sur les récifs coralliens se soit d’abord attachée à l’étude des coraux adultes, de nombreuses informations manquent sur la reproduction sexuée et asexuée, et leur rôle dans l

APA, Harvard, Vancouver, ISO, and other styles

4

Kozlowski, Djampa. "Contribution des éléments transposables à l’adaptabilité de ravageurs de cultures en absence de reproduction sexuée." Electronic Thesis or Diss., Université Côte d'Azur, 2020. http://www.theses.fr/2020COAZ6028.

Full text

Abstract:

Les nématodes à galles (genre Meloidogyne) sont parmi les parasites de plantes les plus nuisibles. Ces organismes se distinguent par la diversité de leurs modes de reproduction. Étonnement, il a été observé que les espèces les plus néfastes se reproduisent de manière strictement asexuée et certaines sont capables de contourner la résistance de la plante hôte en un nombre de générations restreint. Ainsi, bien qu'incapables de combiner des mutations bénéfiques provenant de différents individus, ces espèces peuvent s'adapter à des changements du milieu. L’adaptabilité et le succès parasitaire de

APA, Harvard, Vancouver, ISO, and other styles

5

Ricci, Lorenzo. "A new model to study alternative developments : asexual propagation and regeneration in the basal chordate Botryllus schlosseri." Electronic Thesis or Diss., Paris 6, 2015. http://www.theses.fr/2015PA066683.

Full text

Abstract:

Chez l’ascidie coloniale Botryllus schlosseri, en plus de l’embryogénèse existent deux voies de développement aboutissant à la production de la même structure : l’organisme adulte ou zooide. Ces développements alternatifs ont lieu lors de processus biologiques distincts : le bourgeonnement palléal (BP) et le bourgeonnement vasculaire (BV). Le BP est un processus de multiplication asexuée présentant une ontogénèse stéréotypée. En revanche, le BV est un phénomène régénératif, induit dans les vaisseaux sanguins de la colonie par l’ablation de tous les zooides et bourgeons palléaux. Mes travaux de

APA, Harvard, Vancouver, ISO, and other styles

6

Cortes, Blanca R. "Horizontal genetic transfer in asexual fungi." FIU Digital Commons, 2000. http://digitalcommons.fiu.edu/etd/2644.

Full text

Abstract:

Four aspects of horizontal genetic transfer during heterokaryon formation were examined in the asexual pathogen Fusarium oxysporum f.sp. cubense (Foe): 1) variability based on method of heterokaryon formation 2) differences in nuclear and mitochondrial inheritance 3) the occurrence of recombination without nuclear fusion 4) the occurrence of horizontal genetic transfer between distantly related isolates. The use of non- pathogenic strains of Fusarium oxysporum as biocontrol agents warrants a closer examination at the reproductive life cycle of this fungus, particularly if drag resistance or pa

APA, Harvard, Vancouver, ISO, and other styles

7

Laaka-Lindberg, Sanna. "Ecology of asexual reproduction in hepatics /." Helsinki : Yliopistopaino, 2000. http://ethesis.helsinki.fi/julkaisut/mat/ekolo/vk/laaka-lindberg.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Polak, Eline. "Asexual sporulation in the basidiomycete Coprinus cinereus /." [S.l.] : [s.n.], 1999. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=13125.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Gingas, Vicki Marie. "Asexual embryogenesis and plant regeneration in Quercus /." The Ohio State University, 1988. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487588939088322.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Anciaux, Yoann. "Dynamiques éco-évolutives en populations asexuées : sauvetage évolutif dans le paysage adaptatif de Fisher." Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTT135/document.

Full text

Abstract:

La capacité de persistance d’une population face à un changement environnemental stressant est une question complexe à l’interface entre l’écologie et l’évolution. Le processus par lequel une population échappe à l’extinction en s’adaptant aux nouvelles conditions environnementales stressantes est nommé sauvetage évolutif. Ce cas particulier de dynamique éco-évolutive est de plus en plus étudié autant théoriquement, qu’expérimentalement, entre autres dans le contexte des changements environnementaux d’origines anthropiques. Cependant, les études modélisant ce processus négligent les interactio

APA, Harvard, Vancouver, ISO, and other styles

11

Jenkins, Christina. "Resource limitation in sexual vs. asexual Potamopyrgus antipodarum." Thesis, University of Iowa, 2010. https://ir.uiowa.edu/etd/521.

Full text

Abstract:

The question of why sexual reproduction is so prevalent in natural populations has been called the "queen of questions" in evolutionary biology (Bell, 1982). One potential answer to this question may come from studying whether sexuals and asexuals respond differently to a resource-limited environment. If asexuals require more resources to grow and reproduce at the same rate as sexuals, it could negate the two-fold cost of sexual reproduction. Here, I use Potamopyrgus antipodarum, to empirically address this possibility. First, I consider whether differences in genetic diversity between sexual

APA, Harvard, Vancouver, ISO, and other styles

12

Söderberg, Jonas. "Surviving the ratchet : Modelling deleterious mutations in asexual populations." Doctoral thesis, Uppsala universitet, Molekylär evolution, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-157897.

Full text

Abstract:

One of the most unforgiving processes in nature is that of Muller's ratchet, a seemingly irreversible accumulation of deleterious mutations that all organisms have to deal with or face extinction. The most obvious way to avoid fitness collapse is recombination, though asexual populations usually do not have the luxury of recombining freely. With the aid of computational and mathematical models, we have studied other situations where this threat is averted and the organism can survive the ratchet. The results show that a ratchet where all mutations have the same deleterious fitness effect is v

APA, Harvard, Vancouver, ISO, and other styles

13

Fierro-Constain, Laura. "La reproduction chez Oscarella lobularis (Porifera - Homoscleromorpha) : gènes impliqués et effets de l'environnement." Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4088.

Full text

Abstract:

Les Porifères et les Cténophores sont probablement les deux lignées animales les plus anciennes. Leur étude permet de retracer l’histoire précoce des métazoaires, et d’aborder l'origine de la distinction entre les lignées somatique et germinale. En effet, chez les éponges cette distinction n’existe pas: les archéocytes et choanocytes pouvant donner les cellules somatiques et les gamètes.Après avoir établi la liste des gènes considérés comme impliqués dans la gamétogenèse chez les métazoaires, j’ai caractérisé leurs séquences et retracé leur histoire grâce à des analyses comparatives intégrant

APA, Harvard, Vancouver, ISO, and other styles

14

Docking, T. Roderick. "The evolution of retrotransposon sequences in four asexual plant species /." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81327.

Full text

Abstract:

Since their discovery, transposable elements (TEs) have been regarded either as useful building blocks of genomes, or as "selfish DNA": genetic parasites that exploit the sexual cycle to spread in copy number within populations to the detriment of their hosts. If the "selfish DNA" hypothesis is correct, TEs are expected to deteriorate and be lost from asexual populations. This thesis tests the predictions of the "selfish DNA" hypothesis in four asexual plant species, focusing on patterns of nucleotide diversity and nucleotide substitution. Sequences bearing strong resemblance to known

APA, Harvard, Vancouver, ISO, and other styles

15

Luk, Ka Wing. "An exploratory study of asexual marriage on a Chinese website." HKBU Institutional Repository, 2013. https://repository.hkbu.edu.hk/etd_oa/30.

Full text

Abstract:

The process of individualization is increasingly permeating all levels of Chinese society. This research attempts to highlight some aspects on how Chinese individualization is emerging in marriage and the family through the prism of China’s emerging “asexual marriage” – a consensual partnership that has no sex or a limited amount of sex. Collecting qualitative data in different ways, this study first examines the less obvious and less studied effects of China’s sexual revolution as part of the individualization process brought to the asexual individuals on a specific matchmaking website WX920.

APA, Harvard, Vancouver, ISO, and other styles

16

Dench, Jonathan. "New Computational Approaches to Study the Evolution of Asexual Haploids." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/40415.

Full text

Abstract:

Numerous factors can influence the evolutionary fate of mutations. Despite this, we tend to study strong evolutionary drivers, or evolution under simple contexts, in part because they are the conditions we have a means to study. My thesis evaluates novel computational approaches to advance detection, and study, of factors that influence a mutation’s evolutionary outcome. First, I present the novel computational tool AEGIS that I use to detect phylogenetic signals of correlated evolution followed by an experimental approach to evaluate the role of epistasis as a potential cause of correl

APA, Harvard, Vancouver, ISO, and other styles

17

Hagen, R. H., and D. A. Palzkill. "Air-layering as a Method of Asexual Propagation of Mesquite." College of Agriculture, University of Arizona (Tucson, AZ), 1989. http://hdl.handle.net/10150/216058.

Full text

Abstract:

Three 12-year-old Prosopis chilensis were successfully layered in spring and late summer. The best rooting occurred with 1 cm stems treated with either 5,000 or 15,000 ppm IBA. Air-layers treated with IBA had a higher rooting rate and better root quality than untreated air-layers.

APA, Harvard, Vancouver, ISO, and other styles

18

Carrillo, Medrano Claudia del Carmen. "Mathematical models for the coexistence of sexual and asexual conspecifics." Thesis, University of Bath, 2002. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269840.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Rice, Christopher Steven. "Evolution of meiosis genes in sexual vs. asexual Potamopyrgus antipodarum." Thesis, University of Iowa, 2015. https://ir.uiowa.edu/etd/1739.

Full text

Abstract:

How asexual reproduction affects genome evolution, and how organisms that are ancestrally sexual alter their reproductive machinery upon becoming asexual are both central unanswered questions in evolutionary biology. While these questions have been addressed to some extent in organisms such as asexual clams, rotifers, ostracods, arthropods, and fungi, the most powerful and direct tests of how sex and its absence influence evolution requires direct comparisons between closely related and otherwise similar sexual and asexual taxa. Here, I quantify the rates and patterns of molecular evolution in

APA, Harvard, Vancouver, ISO, and other styles

20

Loewe, Laurence. "Evolutionary bioinformatics predicting genetic stability of asexual genomes by global computing /." [S.l.] : [s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=969894201.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Johnston, Amal Joseph. "Functional genomics of sexual and asexual reproduction in Arabidopsis and relatives /." Zürich, 2007. http://opac.nebis.ch/cgi-bin/showAbstract.pl?sys=000254731.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Tiley, Anna Mystica Mendez. "Investigating asexual sporulation in Zymoseptoria tritici, a fungal pathogen of wheat." Thesis, University of Bristol, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.715767.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Maxwell, Danielle. "It's not just about sex : asexual identity and intimate relationship practices." Thesis, University of York, 2017. http://etheses.whiterose.ac.uk/18006/.

Full text

Abstract:

Queer and feminist scholars frequently claim that non-heteronormative sexualities, like asexuality, challenge heteronormative practices within intimate relationships. They argue that these sexualities lead to the emergence of new intimate practice and have the potential to revolutionise what is understood as the sexual “public story”—one in which a sexual assumption is repeatedly performed and an absence is culturally denied, sometimes to the point of pathologisation (Carrigan, 2011; Przybylo, 2011; Jamieson, 1998). A more recent analysis of asexuality suggests that there is very little eviden

APA, Harvard, Vancouver, ISO, and other styles

24

Brandt, Alexander [Verfasser]. "No sex, No problem? Mutation accumulation in asexual animals / Alexander Brandt." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2020. http://d-nb.info/1234848937/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Cianciolo, Jennifer M. "Evolutionary persistence and co-existence of sexual and asexual oribatid mites." [Bloomington, Ind.] : Indiana University, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3331269.

Full text

Abstract:

Thesis (Ph.D.)--Indiana University, Dept. of Biology, 2008.<br>Title from PDF t.p. (viewed on Jul 27, 2009). Source: Dissertation Abstracts International, Volume: 69-11, Section: B, page: 6533. Advisers: Michael Wade; Curt Lively.

APA, Harvard, Vancouver, ISO, and other styles

26

Bui, Linh Thuy. "Molecular dissection of asexual reproduction in the model fern Ceratopteris richardii." Diss., University of Iowa, 2014. https://ir.uiowa.edu/etd/6380.

Full text

Abstract:

The life cycle of all land plants is characterized by the alternation between two multicellular generations: haploid gametophytes and diploid sporophytes. Whereas meiotic recombination and fertilization via sexual reproduction is known to confer adaptive evolutionary benefits, some plant species can reproduce asexually bypassing meiosis and fertilization yet still undergo alternation of generations. In ferns, the two asexual reproductive pathways are termed apogamy and apospory, i.e. the asexual reproduction of sporophytes and gametophytes, respectively. Although understanding the process of a

APA, Harvard, Vancouver, ISO, and other styles

27

Tvedte, Eric S. "Genome evolution in parasitic wasps: comparisons of sexual and asexual species." Diss., University of Iowa, 2018. https://ir.uiowa.edu/etd/6516.

Full text

Abstract:

The fate of any lineage is contingent on the rate at which its genome changes over time. Genome dynamics are influenced by patterns of mutation and recombination. Mutations as the raw force of variation can be acted on independently during exchanges of homologous genetic regions via meiotic recombination. While molecular evolution in sexual lineages is impacted by both mutation and recombination, asexual lineage fate is primarily influenced by the mutation rate; recombination is often altered or absent in asexuals. Although multiple studies show accelerated mutation accumulation in asexual lin

APA, Harvard, Vancouver, ISO, and other styles

28

Griffin, Clare Louise, and clare griffin@flinders edu au. "A comparison of the ecology and behaviour of parthenogenetic and sexual taxa of the Australian skink, Menetia greyii: implications for coexistence." Flinders University. School of Biological Sciences, 2006. http://catalogue.flinders.edu.au./local/adt/public/adt-SFU20070202.132116.

Full text

Abstract:

Menetia greyii, a small Australian skink, has recently been determined to be a species complex that consists of both sexual and parthenogenetic taxa (Adams et al. 2003). In total, seven distinct taxa have been identified in the south-central region of Australia. This includes three sexual taxa, three apparent parthenogen lineages, and one lizard of uncertain status The study population occurs near Bundey Bore station in the semi-arid region of South Australia (approximately 160km north east of Adelaide). At this site, one sexual taxon (SAS) and two all-female parthenogenetic taxa (WP and RP3

APA, Harvard, Vancouver, ISO, and other styles

29

Renaut, Sébastien. "Mean fitness of long-term sexual and asexual populations of Chlamydomonas in benign environments." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80862.

Full text

Abstract:

Populations of Chlamydomonas were maintained in a benign laboratory environment as obligatory sexual or asexual populations for five years. Sexual reproduction is expected to facilitate the elimination of mildly deleterious mutations and thereby increase the mean fitness of a sexual population relative to an asexual population (Kondrashov 1988). Fitness in competition and in pure culture was measured. In neither of the fitness assays, both in solid and liquid cultures of Chlamydomonas, was a fitness advantage of sexual reproduction seen, even though the results varied depending on the d

APA, Harvard, Vancouver, ISO, and other styles

30

Hunter, Shenae. "Asexual cultivation techniques of the red macroalgae Asparagopsis taxiformis for commercial application." Thesis, Hunter, Shenae (2022) Asexual cultivation techniques of the red macroalgae Asparagopsis taxiformis for commercial application. Masters by Research thesis, Murdoch University, 2022. https://researchrepository.murdoch.edu.au/id/eprint/65504/.

Full text

Abstract:

Asparagopsis is a genus of red macroalgae (seaweed) endemic to coastal waters in Australia and characterised by its complex heteromorphic life history. Previous research discovered Asparagopsis metabolites such as bromoform reduce methanogenesis in livestock rumen by up to 99%. Agriculture accounts for 14% of Australia's total greenhouse gas emissions, predominantly derived from enteric fermentation from ruminant livestock. Cultivating this macroalga is of environmental significance, given the urgency of emission reductions for climate change mitigation while meeting market demand for meat. Un

APA, Harvard, Vancouver, ISO, and other styles

31

Cordle, Angela Ruth. "Genes involved in asexual sporophyte development in Ceratopteris richardii and Arabidopsis thaliana." Diss., University of Iowa, 2012. https://ir.uiowa.edu/etd/4598.

Full text

Abstract:

The life cycle of land plants alternates between the haploid gametophyte and the diploid sporophyte generations. Asexual reproductive strategies, that bypass meiosis and fertilization, have evolved in diverse land plant taxa. Apogamy is one such strategy that produces a sporophyte directly from a gametophyte cell. The genes that drive the process of apogamy are unknown. Knowledge of these genes and their functions will provide insight into the evolution of asexual reproduction, the sporophyte body plan and the alternation of generations in land plants. My Ph. D. research has focused on identif

APA, Harvard, Vancouver, ISO, and other styles

32

Fonseca, da Silva Marques Raquel. "Drivers and fate of jellyfish blooms : The case study of Aurelia coerulea in the Thau lagoon, North Western Mediterranean." Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTG036.

Full text

Abstract:

Les méduses sont des composants importants des écosystèmes marins. Leurs proliférations spectaculaires ont de graves impacts écologiques et socioéconomiques et sont apparemment renforcées par les pressions anthropiques en milieu marin. Les inquiétudes suscitées par l’accroissement de la fréquence et de l’intensité de ces proliférations, du moins dans certaines régions du globe, appellent à une compréhension plus approfondie de leurs causes. Cependant, la plupart des méduses ont un cycle de vie complexe, comprenant à la fois des stades benthiques et pélagiques, ce qui complique la compréhension

APA, Harvard, Vancouver, ISO, and other styles

33

Park, Arum. "Parthenogenesis in Hesiod’s Theogony." Penn State University Press, 2014. http://hdl.handle.net/10150/622192.

Full text

Abstract:

This article examines female asexual reproduction, or parthenogenesis, in Hesiod’s Theogony and argues that it is a symptom of the unprecedented and unparalleled female presence Hesiod inserts into his cosmos. This presence in turn reflects Hesiod’s incorporation of gender difference and conflict as indispensable both to the creation and, paradoxically, to the stability of the universe. Five of Hesiod’s deities reproduce parthenogenetically: Chaos, Gaea, Night, Strife, and Hera, of whom all but the sexually indeterminate Chaos are female. Hesiod’s male gods have no analogous reproductive abil

APA, Harvard, Vancouver, ISO, and other styles

34

Bode, Susanna Natalia Saskia. "Phylogeny and phylogeography of European sexual and asexual lineages of Eucypris virens (Crustacea:Ostracoda)." Thesis, University of Sheffield, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531120.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Phillips, Sarah Wynne. "Asexual overwintering and morph determination in the lettuce root aphid Pemphigus bursarius (L.)." Thesis, University of Birmingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368424.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Hanson, Sara Jeanette. "The molecular evolution of reproduction in animals: insights from sexual and asexual rotifers." Diss., University of Iowa, 2013. https://ir.uiowa.edu/etd/1618.

Full text

Abstract:

Sex and meiosis are ubiquitous in eukaryotes as the primary mode of reproduction. This suggests that despite the theoretical energetic advantages of asexual reproduction, organisms capable of sexual reproduction are at a much greater long-term evolutionary advantage. Rotifers, a group of microinvertebrates, offer unique opportunities to examine the evolution of sex due to their extensive proliferation, successful adaptation to a wide variety of ecological niches, and the diversity of reproductive modes represented in the group. The cyclically parthenogenetic monogonont rotifers have overcome c

APA, Harvard, Vancouver, ISO, and other styles

37

Audiffren, Julien. "Etude d'un système d'équations différentielles stochastiques : Le cliquet de Muller." Thesis, Aix-Marseille 1, 2011. http://www.theses.fr/2011AIX10124.

Full text

Abstract:

Le cliquet de Muller est un modèle mathématiques illustrant l'accumulation de mutations délétères dans une population asexuée. L'idée principale est que l'absence de recombinaison oblige les enfants à avoir au moins autant de mutations nocives que leurs parents, et au bout d'un certain temps, le nombre minimum de mutations délétères de la population, qui est donc un processus croissant, augmente : on dit alors que le cliquet clique. Le modèle du cliquet de Muller qui est étudié dans cette thèse est un système infini d'équations différentielles stochastiques de Fleming-Viot couplées. On montre

APA, Harvard, Vancouver, ISO, and other styles

38

Earnshaw, Diana Mary dos Santos. "Variation in aggressiveness and fungicide sensitivity in sexual and asexual progeny of Phytophthora infestans." Thesis, Bangor University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409470.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Riley, Rohan. "Clues of Sexual Reproduction in the 'Ancient Asexual' Fungal Lineage: The Arbuscular Mycorrhizal Fungi." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24035.

Full text

Abstract:

Arbuscular mycorrhizal fungi (AMF) represent an ancient and critical symbiotic partner with the majority of land plants, understood to promote ecosystem productivity and biodiversity and are also important to ecologically sound land management practices. The fungus is thought to be over 400 million years old, and due to a lack of an observable sexual cycle, has been placed into a select group of eukaryotes called 'ancient asexuals', which seemingly defy evolutionary theory by persisting for an extended period of time in the absence of sexual reproduction. Recently however, molecular evidence

APA, Harvard, Vancouver, ISO, and other styles

40

Kay, William Tudor. "Novel insights into the asexual life-cycle of the wheat-leaf pathogen Zymoseptoria tritici." Thesis, University of Exeter, 2017. http://hdl.handle.net/10871/31538.

Full text

Abstract:

Zymoseptoria tritici, the causal agent of Septoria tritici blotch (STB), is the most economically important pathogen of wheat in temperate climates. EU spending on the control of STB is estimated at more than € 1.3 billion per annum, even when tolerant cultivars are used. This thesis comprises 5 data chapters each looking to ascertain reasons for the success of Z. tritici. Using mainly in vitro methods combined with confocal microscopy, this thesis explores asexual spore submergence in rain, epiphytic development, the potential triggers for pycnidiation, low-nutrient ex planta survival, and so

APA, Harvard, Vancouver, ISO, and other styles

41

Kitade, Yuki. "Functional analysis of signaling components regulating pathogenicity and asexual/sexual development in Bipolaris maydis." Kyoto University, 2019. http://hdl.handle.net/2433/242717.

Full text

Abstract:

Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第21840号<br>農博第2353号<br>新制||農||1069(附属図書館)<br>学位論文||H31||N5212(農学部図書室)<br>京都大学大学院農学研究科地域環境科学専攻<br>(主査)教授田中千尋, 教授本田与一, 准教授刑部正博<br>学位規則第4条第1項該当

APA, Harvard, Vancouver, ISO, and other styles

42

Li, Dan. "A map kinase pathway essential for mating and contributing to asexual development in Neurospora Crassa." Texas A&M University, 2003. http://hdl.handle.net/1969.1/3936.

Full text

Abstract:

MAP kinases and transcription factors homologous to Saccharomyces cerevisiae Fus3p/Kss1p and Ste12p have been identified in several plant pathogenic fungi and found to be required for pathogenicity and sexual reproduction. A gene encoding the homolog of Fus3p/Kss1p in Neurospora crassa was isolated previously and named mak- 2 (mitogen activated kinase -2). This dissertation describes the isolation of the Ste12p homolog, pp-1 (protoperithecia-1) and the comparison of the phenotypes of the mak-2 and pp-1 mutants. The similar phenotypes of the mak-2 and pp-1 null mutants suggest that these protei

APA, Harvard, Vancouver, ISO, and other styles

43

Ma, Xiping. "Effects of environmental factors on distribution and asexual reproduction of the invasive hydrozoan, Moerisia lyonsi." College Park, Md. : University of Maryland, 2003. http://hdl.handle.net/1903/99.

Full text

Abstract:

Thesis (M.S.) -- University of Maryland, College Park, 2003.<br>Thesis research directed by: Marine, Estuarine, Environmental Sciences Graduate Program. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

APA, Harvard, Vancouver, ISO, and other styles

44

Kownatzki, Dierk. "Asexuelle und sexuelle Reproduktion bei der Vogelkirsche (Prunus avium L.)." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=963808451.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Awah, Nancy. "Studies on Plasmodium falciparum asexual blood stage antigens : RAP-2/RSP-2 and Pf332 in focus." Doctoral thesis, Stockholms universitet, Wenner-Grens institut, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-57255.

Full text

Abstract:

The life cycle of the malaria parasite is very complex and provides a number of potential targets for vaccination. In this thesis, data on two plasmodial asexual blood stage antigens (RAP-2 and Pf332) are presented. A partial aim of the work presented herein was to investigate the mechanisms responsible for the destruction of erythroid cells in anaemia, and more specifically to define the role of the rhoptry associated protein (RAP)-2 and other members of the RAP complex, RAP-1 and -3 in processes resulting in anaemia. Antibodies to the RAP complex were shown to have the potential to mediate t

APA, Harvard, Vancouver, ISO, and other styles

46

Blanco, Paananen Adrian, and Johan Storby. "Observing coevolution in simulated bacteria : Using asexual reproduction and simple direct mapped functions for decision-making." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-146346.

Full text

Abstract:

In this report we have presented the results of a program which performs simula- tions of artificial bacteria with the ability to evolve different characteristics and behaviours through genetic algorithms. Over time unfit bacteria will die out, and the more fit bacteria will produce offspring with slightly mutated variants of it’s genetic code resembling the evolutionary process. The simulation does not follow the traditional macro-scale hand-picked sexual reproduction often used in genetic algorithms to produce optimal results, but it instead uses individ- ual asexual reproduction which more

APA, Harvard, Vancouver, ISO, and other styles

47

Thompson, Faye Laura. "Somatic, genetic and evolutionary trade-offs between sexual and asexual reproduction in a clonal aquatic plant." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2002. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ65650.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Piquot, Yves. "Evolution d'un systeme de reproduction mixte sexuee-asexuee approche genetique et ecologique chez sparganium erectum l." Paris 11, 1996. http://www.theses.fr/1996PA112301.

Full text

Abstract:

Sparganium erectum (le rubanier), comme la majorite des plantes perennes, se reproduit a la fois de facon sexuee et de facon vegetative. Le cout ecologique et genetique de la reproduction secuee, nous a amene a poser la question de la stabilite a l'echelle de l'espece d'un systeme de reproduction mixte sexuee-asexuee par rapport a un mode de reproduction exclusivement vegetatif. Nous avons aborde cette question (1) par l'identification de marqueurs moleculaires et allozymiques permettant de determiner dans quelles mesures les populations naturelles se distinguent par leur diversite genotypique

APA, Harvard, Vancouver, ISO, and other styles

49

Crabtree, Sheri Beth. "SEXUAL AND ASEXUAL REPRODUCTIVE CHARACTERISTICS OF THE NORTH AMERICAN PAWPAW [ASIMINA TRILOBA (L.) DUNAL]." Lexington, Ky. : [University of Kentucky Libraries], 2004. http://lib.uky.edu/ETD/ukypssc2004t00208/etd.pdf.

Full text

Abstract:

Thesis (m.s.)--University of Kentucky, 2004.<br>Title from document title page (viewed Jan. 7, 2005). Document formatted into pages; contains viii, 80p. : ill. Includes abstract and vita. Includes bibliographical references (p. 74-79).

APA, Harvard, Vancouver, ISO, and other styles

50

Widmer, Chad L. "Influences of temperature and salinity on asexual reproduction and development of scyphozoan jellyfish from the British Isles." Thesis, University of St Andrews, 2015. http://hdl.handle.net/10023/6326.

Full text

Abstract:

Jellyfish (Phylum Cnidaria, Class Scyphozoa) play important roles in pelagic ecosystems as predators and prey. Seasonally they form blooms facilitating reproductive success, but that are at times problematic for human enterprise. Medusa abundance has been correlated with environmental variables in several instances. However, the direct mechanisms for changes in medusa abundance are unclear. As global sea surface temperatures continue to change there is increasing concern that warming may enhance conditions favourable for the generation of jellyfish medusae. It is important to understand the wa

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!