[Importance of genetic recombination for the preservation and progress of species in the course of evolution].
The role of genetic recombinations is considered in the context of ecological stability of organisms. The ecological stability is taken as a special notion distinct from fitness in its original sense as the Maltusian parameter according to R. Fisher. The genetic exchange within the species provides the recovery of a species specific level of ecological stability that is lowered in particular individuals as a result of the accumulation of mutations in microevolutionary processes. It is supposed that the accumulation of the mutations that decrease organisms' ecological stability leads to the action of truncated selection. This type of selection explains the advantage of recombination in the model of A.S. Kondrashov (1982). In the evolving species, ecological stability is gradually increasing in the process of evolution as a result of hybridization between the narrow-specialized races. Genetic recombinations provide a constant DNA homogenization within the species and, therefore, the species integrity as an elementary structure responsible for the preservation and rise in the level of ecological stability of organisms in evolving lineages.
Sukhodelets
V V
VV
State Research Institute of Genetics and Selection of Industrial Microorganisms, 117545 Moscow, 1-st Dorozhny Proezd, 1. sukhodol@genetika.ru
D000818:Animals; D005075:Biological Evolution; D004171:Diploidy; D004463:Ecology; D005828:Genetics, Population; D009154:Mutation; D018521:Plant Physiological Phenomena; D011995:Recombination, Genetic; D012098:Reproduction / Q000235:genetics*; D012100:Reproduction, Asexual / Q000235:genetics; D012641:Selection, Genetic