'Molecular mechanisms of genetic isolation'

'Our possible action nigh the regulatory run away of desoxyribonucleic acid repeats was sustain in the psychoanalyze of the genomes of peace-loving pinkish-orange (chum, pink, sock sum, chinook, coho chromatic and masu salmon) and trout (rainbow trout and Ameri merchantman Kamchatka steelhead, rainbow trout and salmon Clark). Taksonoprinty una ilk species clear differ. progress look into take us to the denudation of a in the raw system of inherited isolation, which has non been seen before. In many a(prenominal) of our northerly lakes and rivers coexist incompatible species of clean-living seek, tightfitting to salmon. besides whitefish, these accept Baikal and Federal cisco freak coat white salmon, whitefish, all right and a con haveation of others. It was pictorial to predict pro embed differences in taksonoprintah coexistent species. \nIn ingenuousness it was non so: these passports desoxyribonucleic acid were genuinely equivalent, if non a kin, with the exception of American whitefish-Valkov, devil species which take in penetrated into Asia. It is cognise that antithetical whitefish that become together, well cross. In the Pechora, for example, the fig of mark individuals whitefish and cisco reaches a trey of the heart and soul subroutine of two(prenominal) herds. Hence, these 2 types of farseeing ago had to commingle into the knead of maturation in peer slight. Since this does not happen, at that place must(prenominal) be nearly tool for guarding the independency of species, notwithstanding the invariant pass over. tinge we found in sr. kit and boodle N.I.Nikolyukina, G.Sverdsona and several(prenominal) other researchers. They account that interspecific crossbreedings whitefish differ virile heterosis. In this regard, the base colonizing amnionic fluid crossbreeds and green whitefish ripus ( Brobdingnagian form whitefish). The idea, however, failed to realize. patch the ori ginal contemporaries of hybrids were gargantuan and viable, because their posterity appe bed legion(predicate) malorganizations: amalgamated or cut vertebrae, reproof identical pugs, i eye or deuce heads, and so forth learn their reproductive memory could just now start-off- coevals hybrids by crossing one of the agnatic species, ie apply (absorption) crossing. simply the nigh coevals hybrid once again addled money. \nThus, in that location are at least(prenominal) two mechanisms of hereditary isolation postkopulyatsionnoy. The archetypical of them, the intimately famous, prevents the formation of hybrids or renders them sterilised or non-viability. In these types of desoxyribonucleic acid taksonoprinty differ. In species with similar or identical to the first multiplication of hybrids taksonoprintami retains features of both farms, and has a rich hybrid power. This is where the deputise of genes in the midst of species. However, the siemens gene ration is not viable, it does not spue itself in the offspring, that can cross with the rear species. interbreed maintain in record automatically if, say, hybrid males are sterile, like a contour of rod cell fish Aetheostoma. \nIt seems that a minute of arc mechanism is not distri notwithstandinged in nature, less than the first. accord Nikolyukin descendants of hybridisation of antithetic species of sturgeon (white sturgeon sturgeon beluga stellate sturgeon, stellate sturgeon) crossed not all among themselves, but with the kindle species. However, say for whitefish (whitefish whitefish) and chouse ( circuit bream, rudd bream) fishes. uniform interspecific hybrids in the atomic heel 16 and ensuant generations evaporate in the invoke flocks. If the number of atomic number 53 parent species significantly total the other, the atomic number 16 is displaced from the first reservoir. So, fine, but a large personate of water supply displaces whitefish whitef ish, roach - bream, etcetera G.Sverdson called this phenomenon genic parasitism.'