We propose a model of phenotype evolution and a model of evolution of many-component ecosystem. The models are constructed in the framework of the Bak-Sneppen approach for modeling of self-organization Processes in biological evolution. In the model of phenotype evolution we consider cases of stabilizing, directed And disruptive natural selection. From computer simulations we obtain probability distributions of phenotype Signs. It has been shown that the distributions have a form which is typical for the phenomenon of self-organized Criticality and which weakly depends on details of a dynamical role of the model.
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