Jorge S. Sá Martins

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Earthquake faults occur in interacting networks having emergent space-time modes of behavior not displayed by isolated faults. Using simulations of the major faults in southern California, we find that the physics depends on the elastic interactions among the faults defined by network topology, as well as on the nonlinear physics of stress dissipation(More)
The reasons why sexual reproduction appeared, hundreds of million years ago, are still under investigation today [1]. One of the reasons commonly used to justify sex is the higher genetic diversity it produces if compared to asexual reproduction. On the other hand, sex is closely related to aging: all sexual species present aging, which starts as soon as(More)
The concept of random deaths in a computational model for population dynamics is critically examined. We claim that it is just an artifact, albeit useful, of computational models to limit the size of the populations through the use of the socalled Verhulst factor and has no biological foundation. Alternative implementations of random deaths strategies are(More)
Results obtained by the application of the Penna model to problems of evolutionary theory are reviewed. The genesis of diploid organisms is studied and compared to other forms of polyploidity. The addition of phenotype-dependent selection and its consequences, considering ecological and/or sexual selection traits, are discussed. This addition made possible(More)
We removed from the Penna model for biological ageing any random killing Verhulst factor. Deaths are due only to genetic diseases and the population size is fixed, instead of fluctuating around some constant value. We show that these modifications give qualitatively the same results obtained in an earlier paper, where the random killings (used to avoid an(More)
We have simulated the evolution of sexually reproducing populations composed of individuals represented by diploid genomes. A series of eight bits formed an allele occupying one of 128 loci of one haploid genome (chromosome). The environment required a specific activity of each locus, this being the sum of the activities of both alleles located at the(More)