Dependência da velocidade da catraca de Muller com fluxo de mutações benéficas: uma avaliação estocástica

Detalhes bibliográficos
Ano de defesa: 2006
Autor(a) principal: RAPOSO, Oscar Felipe Falcão lattes
Orientador(a): CAMPOS, Paulo Roberto de Araújo
Banca de defesa: COSTA, Ernande Barbosa da, CORDEIRO, Gauss Moutinho, FONTANARI, José Fernando
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal Rural de Pernambuco
Programa de Pós-Graduação: Programa de Pós-Graduação em Biometria e Estatística Aplicada
Departamento: Departamento de Estatística e Informática
País: Brasil
Palavras-chave em Português:
Palavras-chave em Inglês:
Área do conhecimento CNPq:
Link de acesso: http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/5236
Resumo: We investigate the evolution of asexual populations subject to a large supply of deleterious mutations such that Muller’s ratchet operates. In this regime, the accumulation of deleterious mutations takes place continuously with the resulting loss of the least-loaded class of individuals. In the current work, we study the effect of the supply of beneficial mutations on the ratchet’s speed. We also examine how the rate of substitution of favorable mutations as well as the mean selective effect of favorable mutations that reach fixation is compared to those assuming a population at equilibrium. We observe that under Muller’s ratchet, the rate of fixation of advantageous mutations is higher than that predicted for an equilibrium population. The difference between the rate supposing an equilibrium regime and that for the non-equilibrium case becomes larger as we increase the rate of deleterious mutations. On the other hand, the mean selective effect of beneficial mutations that reach fixation is smaller than the expected value for the equilibrium situation.