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Tít. de la primera versión: Evolution on genotype networks leads to phenotypic entrapment (arXiv:1307.0968v1) Se corresponde con AR/0000016220 -- Abstract: Large sets of genotypes give rise to the same phenotype because phenotypic expression is highly redundant. Accordingly, a population can accept mutations without altering its phenotype, as long as the genotype mutates into another one on the same set. By linking every pair of genotypes that are mutually accessible through mutation, genotypes organize themselves into neutral networks (NN). These networks are known to be heterogeneous and assortative, and these properties a ect the evolutionary dynamics of the population. By studying the dynamics of populations on NN with arbitrary topology we analyze the e ect of assortativity, of NN (phenotype) tness, and of network size. We nd that the probability that the population leaves the network is smaller the longer the time spent on it. This progressive \phenotypic entrapment" entails a systematic increase in the overdispersion of the process with time and an acceleration in the xation rate of neutral mutations. We also quantify the variation of these e ects with the size of the phenotype and with its tness relative to that of neighbouring alternatives.