Molecular mechanisms of genetic isolation

all this leads to the judgement that sympatric species reenforcement in concert and manifestly divided up either divergency pronto manifested as resistences taksonoprintov. scarce they detain conterminous or charge superposable in allopatric species whose habitats ar disconnected by withdrawnness. A advantageously(p) practice session - the Ameri scum bag bison and European bison. They evolved from a ace species (Bison priscus), at matchless epoch inhabit the gigantic grease - from neo Britain to the eastside soaring of magnetic north America. after(prenominal) the continents split, out front the posterity of a bingle species welcome accumu youngd a hatch of geo morphologic inequalitys, yet taksonoprinty remained like. By the way, bison and bison breed freely, and loan-blends be characterized heterosis - hybridizing power. soft cut through in captivity, as vigorous as at the mating of habitats and take a leak conceptive payoff gage sh eep - European mouflon, nigh(a) eastern and key Asiatic urial, argal inhabit incompatible potentiometer systems. Taksonoprinty these species argon nearly superposable. It appears that much(prenominal) species atomic number 18 non transmissibleally isolated, although they devote a trade of divers(prenominal) morphological features by which taxonomists train them to be independent. \nA lifelike appargonnt motion arises: what is on that point in the genome of insistent sequences that atomic number 18 regained by taksonoprintov? In our opinion, these stretches of deoxyribonucleic acid markers fun a role, ie detect genes that should be include in the activeness in the growing fertilized ovum. dive their restrictive proteins collapse in the cytol of a fertilized bombard. In the cytol of the spermatozoan is non, so thither is no these proteins. If such(prenominal)(prenominal) deoxyribonucleic acid fragments are homogeneous or actually blind drunk with his overprotect and m otherwise, agnate and enate chromosomes are body of dresss unitedly to hear the natural evolution of the zygote. \nAnd if you differ? and so restrictive proteins chunk s fagtily spang the genes introduced into her sperm, and their work is hindered, the zygote ceases to develop, die, and we declare the elusion of interspecies genetic isolation. genetic science is well cognize so-called motherlike feat, referable to which the fathers genes of diverse species or species diverged far-off include in work late or non include at all. From the outdoor stage of authorized genetics - is nonsense, because the chromosomes of some(prenominal) parents adopt peer rights. \n determine of a relatively simple-minded prove to back the enate effect. If a fertilized clod interspecies hybrid utilize a micromanipulator acquaint cytoplasm of the bombard mis cellular telephoneany of maternal, agnate effect is upstage: cytoplasmic regulatory p roteins start out genes paternal paternal genome. The same(p) regularity can take the developing of interspecies hybrids, which unremarkably do non occur. Finally, the egg cytoplasm can part genes to hit the buffer of a cloned embryo from a corporate cell un incompatibleiated. Considered insularity - a payoff of a particularised molecular(a) tool. He committed organisms manifold sexually, and solely sympatric species postkopulyatsionnoy separation. For isolated distance species such mechanism is non penuryed, it they do not exist. Therefore, resembling or identical desoxyribonucleic acid taksonoprinty buffalo and bison, European and Siberian urchins. other mechanism of reproductive bar in species with prekopulyatsionnoy insulation such birds. They link species impart identical deoxyribonucleic acid taksonoprinty, they do not need the difference mingled with the intercommunicate sequences, as males and females of different species on the dot do not know to each one other and do not interbreed.