Mullers Ratchet
Mostrando 1-5 de 5 artigos, teses e dissertações.
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1. Uma abordagem estocástica da evolução do sexo e recombinação / Uma abordagem estocástica da evolução do sexo e recombinação
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.
Publicado em: 2009
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2. Acúmulo de mutações em linhagens assexuadas: uma abordagem via experimentos computacionais / Accumulation of mutations in asexual lineages: a study using computer experiments
Studies about evolution have been developed since Charles Darwins publications about the Origin of species and Natural Selection in 1859. During the XX century major developments were achieved through mathematical and computational modeling, since only few number of species that their evolution can be studied in vivo, once that the time scale involed for dat
Publicado em: 2004
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3. Dinâmica adaptativa, genealogias e testes estatísticos de neutralidade em evolução molecular / Adaptive dynamics, Genealogies and statistical tests of neutrality in molecular evolution
This thesis discusses some topics of molecular evolution, extensively using generating function methods to find analytical results whenever possible. In first place, it gives the exact solution for the dynamics of an infinite population of infinitely long sequences (no back mutations) evolving under the action of deleterious mutations on either multiplicativ
Publicado em: 2004
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4. Dinâmica de modelos de genética de populações com recombinação. / Dynamics of population genetics models with recombination.
Juntamente com o processo de mutação, a recombinação intragênica, vista como a troca recíproca de material genético entre genomas, é um dos principais fatores geradores da diversidade genética. De fato, os diversos mecanismos de recombinação existentes na natureza (sexo, por exemplo) são freqüentemente citados como invenções do processo de evo
Publicado em: 2003
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5. Model for evolution of Y chromosomes and dosage compensation.
Some difficulties with the classical model for the evolution of a genetically invert Y chromosome are discussed. An alternative model is proposed, which is based on the principle of Mullers ratchet; this involves the accumulation of chromosomes bearing deleterious mutant genes in a finite population in the absence of crossing-over. This process would result