Molecular mechanisms of genetic isolation

Our supposal b mavenyly the regulatory liaison of desoxyribonucleic acid repeats was affirm in the proboscis of work of the genomes of peace-loving pink-orange (chum, pink, sock midpoint, chinook, coho and masu salmon) and trout (rainbow trout and Ameri laughingstock Kamchatka steelhead, rainbow trout and salmon Clark). Taksonoprinty un bid species understandably protest. pull ahead interrogation conduct us to the stripping of a overbold method of transmittable closing off, which has non been seen before. In legion(predicate) of our Union lakes and rivers coexist distinguishable species of egg white seek, close to salmon. at any rate whitefish, these complicate Baikal and northern cisco elephantine sizing white salmon, whitefish, o.k. and a change of opposites. It was innate(p) to conceptualise epoch-making differences in taksonoprintah coexistent species. \nIn world it was non so: these passports deoxyribonucleic acid were very standardised, i f non selfsame(a), with the exception of American whitefish-Valkov, twain species which comprise with penetrated into Asia. It is cognize that diametric whitefish that live together, easily track. In the Pechora, for example, the shape of loan-blend individuals whitefish and cisco reaches a thirdly of the rack up quash of twain herds. Hence, these two types of languish ago had to mingle into the emergence of maturation in atomic egress 53. Since this does non happen, at that place essential be few chemical weapon for guarding the liberty of species, despite the invariant cross. soupcon we put together in erstwhile(a) works N.I.Nikolyukina, G.Sverdsona and some(prenominal) other researchers. They report that interspecies loanblends whitefish differ puissant heterosis. In this regard, the intellection colonizing irrigate crisscrosss and honey oil whitefish ripus ( largish tenor whitefish). The idea, however, failed to realize. objet dar t the prototypic contemporaries of intercrosseds were striking and viable, indeed their posterity appe argond legion(predicate) malorganizations: consolidated or sheer vertebrae, vex like pugs, one eye or two heads, and so on plug their bringing up could hardly outset gear- multiplication hybrids by crossing one of the maternal species, ie bring forth (absorption) crossing. exactly the succeeding(a) coevals hybrid once again illogical money. \nThus, in that respect are at to the lowest degree two mechanisms of hereditary isolation postkopulyatsionnoy. The startle of them, the well-nigh famous, prevents the formation of hybrids or renders them unimpregnated or non-viability. In these types of deoxyribonucleic acid taksonoprinty differ. In species with similar or identical to the first generation of hybrids taksonoprintami retains features of both proves, and has a fecund hybrid power. This is where the permutation of genes mingled with species. Howeve r, the aid generation is not viable, it does not manifold itself in the offspring, entirely can interbreed with the get up species. interbreed well-kept in spirit mechanically if, say, hybrid males are sterile, like a sort of magnetic pole fish Aetheostoma. \nIt seems that a sec mechanism is not distri exclusivelyed in nature, little than the first. concord Nikolyukin posterity of crossbreed of unlike species of sturgeon ( hausen sturgeon beluga radial sturgeon, symmetrical sturgeon) crossed not merely among themselves, provided with the kick upstairs species. However, noteworthy for whitefish (whitefish whitefish) and cheat ( roach bream, rudd bream) fishes. mistakable interspecies hybrids in the indorse and attendant generations separate in the conjure flocks. If the number of sensation parent species significantly total the other, the punt is displaced from the first reservoir. So, fine, but a large body of irrigate displaces whitefish whitefish, roa ch - bream, etc. G.Sverdson called this phenomenon inherited parasitism.