منابع مشابه
The evolution of haploidy and diploidy
Tremendous diversity exists among organisms with respect to their ploidy level, defined as the number of sets of homologous chromosomes per cell. As differences in ploidy represent a potentially major genomic change affecting the evolution of a species, it might be thought that ploidy evolution would be well understood. In fact, our knowledge is fragmentary, and there are several open questions...
متن کاملA Computational Model of Evolution: Haploidy versus Diploidy
In this paper the study of diploidy is introduced like an important mechanism for memory reinforcement in arti cial environments where adaptation is very important For this study it has been simulated an ecosystem of birds The individuals of this ecosystem are able to geneti cally learn the best behaviour for survival Critical changes happening in the environmental conditions require the presen...
متن کاملMating systems and the evolutionary transition between haploidy and diploidy
According to the ‘masking hypothesis’, diploids gain an immediate fitness advantage over haploids because diploids, with two copies of every gene, are better able to survive the effects of deleterious recessive mutations. Masking in diploids is, however, a double-edged sword: it allows mutations to persist over time. In contrast, deleterious mutations are revealed in haploid individuals and are...
متن کاملFinite Population Models of Co-evolution and Their Application to Haploidy versus Diploidy
In order to study genetic algorithms in co-evolutionary environments, we construct a Markov model of co-evolution of populations with fixed, finite population sizes. In this combined Markov model, the behavior toward the limit can be utilized to study the relative performance of the algorithms. As an application of the model, we perform an analysis of the relative performance of haploid versus ...
متن کاملHaploidy, diploidy and evolution of antifungal drug resistance in Saccharomyces cerevisiae.
We tested the hypothesis that the time course of the evolution of antifungal drug resistance depends on the ploidy of the fungus. The experiments were designed to measure the initial response to the selection imposed by the antifungal drug fluconazole up to and including the fixation of the first resistance mutation in populations of Saccharomyces cerevisiae. Under conditions of low drug concen...
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ژورنال
عنوان ژورنال: Current Biology
سال: 2008
ISSN: 0960-9822
DOI: 10.1016/j.cub.2008.09.039