Detalhes bibliográficos
| Ano de defesa: |
2009 |
| Autor(a) principal: |
SILVA, Juliana Kátia da
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| Orientador(a): |
CAMPOS, Paulo Roberto de Araújo |
| Banca de defesa: |
SÁTIRO, Caio Veloso,
ROSAS, Alexandre da Silva,
SOUZA, Adauto José Ferreira de |
| Tipo de documento: |
Dissertação
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
Universidade Federal Rural de Pernambuco
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| Programa de Pós-Graduação: |
Programa de Pós-Graduação em Biometria e Estatística Aplicada
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| Departamento: |
Departamento de Estatística e Informática
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| País: |
Brasil
|
| Palavras-chave em Português: |
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| Palavras-chave em Inglês: |
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| Área do conhecimento CNPq: |
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| Link de acesso: |
http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/5013
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Resumo: |
The understanding of the central mechanisms favouring sex and recombination in real populations is one of the fundamental issues in evolutionary biology. Based on a previous stochastic formulation to the study of sex, here we aim to investigate the conditions under which epistasis favours the fixation of the sexual mode of reproduction in a given population. Besides, we try to identify the evolutionary forces which contribute to this process. Our model considers a finite population model which assumes the existence of a recombination modifier allele which can activate the recombination mechanism. We have found that sex is very little favoured in a scenario of antagonistic epistasis, and this advantage only takes place in a narrow range of values of the selection coefficient, sd. On the other hand, synergistic epistasis favours recombination in a very broad domain. However, the major mechanism contributing to the spreading of the modifier allele depends on the range of values of sd. At large sd background selection favours recombination since it increases the efficacy of selection, while at low sd Muller’s ratchet is the leading mechanism. |
