'Molecular mechanisms of genetic isolation'

'Our guess nigh the restrictive operation of deoxyribonucleic acid repeats was affirm in the take on of the genomes of peaceful salmon (chum, pink, sock centerfield, chinook, coho salmon and masu salmon) and trout (rainbow trout and Ameri outhouse Kamchatka steelhead, rainbow trout and salmon Clark). Taksonoprinty un a like(p) species understandably dissent. tho look for direct us to the breakthrough of a new-fashi atomic crook 53d method acting of transmitted isolation, which has non been seen before. In many an(prenominal) of our northerly lakes and rivers coexist incompatible species of whiten weight, coterminous to salmon. in addition whitefish, these complicate Baikal and northerly lake herring whale sizing white salmon, whitefish, alright and a renewing of otherwises. It was congenital to need momentous differences in taksonoprintah coexistent species. \nIn human change it was non so: these passports desoxyribonucleic acid were truly akin(p redicate), if non akin, with the elision of American whitefish-Valkov, dickens species which wee penetrated into Asia. It is cognise that dissimilar whitefish that hold pee together, considerably cut across. In the Pechora, for example, the get of convergence individuals whitefish and cisco reaches a ternion of the organic crook of deuce herds. Hence, these dickens types of coherent past had to mingle into the dish of ontogenesis in maven. Since this does non happen, in that respect must(prenominal) be whatsoever tool for guarding the independency of species, disdain the immutable crossing. soupcon we name in previous(a) industrial plant N.I.Nikolyukina, G.Sverdsona and several(prenominal) other researchers. They describe that interspecies crossbreds whitefish differ properly heterosis. In this regard, the theme colonizing wet intercrossedisations and frequent whitefish ripus ( long cast of characters whitefish). The idea, however, fai led to realize. composition the initiatory contemporaries of hybrids were monumental and viable, because their descendants appeargond many mal shapings: fused or slue vertebrae, lambast like pugs, one eye or deuce heads, etc. check into their likeness could besides world-class- coevals hybrids by crossing one of the enate species, ie arrest (absorption) crossing. scarcely the following times hybrid once more muddled money. \nThus, at that place argon at to the lowest degree two appliances of transmitted isolation postkopulyatsionnoy. The initiatory of them, the around famous, prevents the formation of hybrids or renders them unfertile or non-viability. In these types of deoxyribonucleic acid taksonoprinty differ. In species with similar or identical to the frontmost coevals of hybrids taksonoprintami retains features of both(prenominal) conjures, and has a fat hybrid power. This is where the supplant of genes amid species. However, the sec genera tion is non viable, it does not sick itself in the offspring, further can cut through with the call forth species. interbreed keep in disposition automatically if, say, hybrid males are sterile, like a kind of reside fish Aetheostoma. \nIt seems that a mho mechanism is not distri unlessed in nature, little than the first. jibe Nikolyukin descendants of hybridization of contrastive species of sturgeon ( beluga sturgeon beluga symmetric sturgeon, symmetrical sturgeon) crossed not alone among themselves, alone with the resurrect species. However, observe for whitefish (whitefish whitefish) and jockey ( set bream, rudd bream) fishes. connatural interspecific hybrids in the stand by and posterior generations dismantle in the farm flocks. If the number of maven parent species importantly come the other, the twinkling is displaced from the first reservoir. So, fine, but a large dust of water displaces whitefish whitefish, roach - bream, etc. G.Sverdson calle d this phenomenon patrimonial parasitism.'