[Survival of mutant clones. I. Qualitative analysis of the competition of 2 clones].

Effects which are not in fact connected with the selection or are connected with usual selection ("s" is constant) are errouneously described in some works on "randomly varying selection coefficient s" as specific ones. A model is suggested for the scription of the two clones competition in terms of matrix game theory. Using this model, gene-mutator was shown not to be selectively valid in the case when its activity is not controlled by genetic system.