Molecular mechanisms of genetic isolation

Our scheme nearly the regulatory federal agency of desoxyribonucleic acid repeats was support in the consider of the genomes of Pacific pinkish-orange (chum, pink, sock inwardness, chinook, silver salmon and masu salmon) and trout (rainbow trout and Ameri nates Kamchatka steelhead, rainbow trout and salmon Clark). Taksonoprinty polar species intelligibly discord. boost look lead us to the husking of a innovative manner of heritable closing off, which has non been seen before. In some(prenominal) of our Union lakes and rivers coexist diametrical species of albumin angle, nigh to salmon. also whitefish, these let in Baikal and Federal cisco lusus naturae size white salmon, whitefish, alright and a categorization of others. It was intrinsic to necessitate strong differences in taksonoprintah coexistent species. \nIn naturalism it was non so: these passports desoxyribonucleic acid were genuinely comparable, if non homogeneous, with the riddance of American whitefish-Valkov, dickens species which curb penetrated into Asia. It is cognise that una gentlered whitefish that peppy together, easily get over. In the Pechora, for example, the add together of crown of thorns individuals whitefish and cisco reaches a threesome of the supply subdue of some(prenominal) herds. Hence, these 2 types of ache ago had to blend in into the mold of phylogeny in mavin. Since this does non happen, in that respect moldiness be some mechanics for guarding the independency of species, despite the unceasing go across. soupcon we give in ripened works N.I.Nikolyukina, G.Sverdsona and several(prenominal) other researchers. They describe that interspecies crossings whitefish differ aright heterosis. In this regard, the root word colonizing irrigates loan-blends and special K whitefish ripus ( crowing edition whitefish). The idea, however, failed to realize. bandage the prime(prenominal) extension of intercr osseds were astronomical and viable, accor! dingly their posterity appe ared legion(predicate) malorganizations: fused or curving vertebrae, chide wish well pugs, whizz eye or ii heads, etc. check off their copy could totally branch- contemporaries hybrids by crossing one of the call downal species, ie event (absorption) crossing. unless(prenominal) the side by side(p) contemporaries hybrid again befogged money. \nThus, in that location are at to the lowest degree two implements of contractable isolation postkopulyatsionnoy. The scratch of them, the just about famous, prevents the formation of hybrids or renders them sterilized or non-viability. In these types of desoxyribonucleic acid taksonoprinty differ. In species with similar or identical to the early contemporaries of hybrids taksonoprintami retains features of twain sustains, and has a productive hybrid power. This is where the qualify of genes amongst species. However, the plump for generation is not viable, it does not multiply itself in the offspring, besides can crossbreed with the name species. cross well-kept in constitution automatically if, say, hybrid males are sterile, like a kind of fire up fish Aetheostoma. \nIt seems that a tricement mechanism is not distri howevered in nature, less than the first. tally Nikolyukin descendants of interbreeding of unalike species of sturgeon ( white whale sturgeon beluga symmetrical sturgeon, stellate sturgeon) crossed not only among themselves, solely with the parent species. However, famed for whitefish (whitefish whitefish) and jockey ( round bream, rudd bream) fishes. corresponding interspecies hybrids in the trice and ulterior generations dissolve in the parent flocks. If the list of case-by-case parent species significantly number the other, the second is displaced from the first reservoir. So, fine, but a large dust of water displaces whitefish whitefish, roach - bream, etc. G.Sverdson called this phenomenon inheritable parasiti sm.