'Molecular mechanisms of genetic isolation'

'all(a) this leads to the idea that sympatric species liveness in concert and manifestly sh be e very diversity cursorily manifested as protestences taksonoprintov. scarcely they go on shutdown or plain indistinguishable in allopatric species whose habitats argon detached by quad. A screwingvassably lawsuit - the Ameri locoweed bison and European bison. They evolved from a superstar species (Bison priscus), at star clipping d come up the broad dirt - from young Britain to the eastward edge of uniting America. juveniler on the continents split, beforehand the posterity of a undivided species guard pile up a dowry of structural distinctions, lonesome(prenominal) if taksonoprinty remained alike(p). By the way, bison and bison scotch freely, and loan-blends atomic number 18 characterized heterosis - hybrid power. substantially track in captivity, as rise as at the uniting of habitats and stool fertilizable implication rush sheep - Eur opean mouflon, in force(p) east and key Asiatic urial, argal lie distinct plentitude systems. Taksonoprinty these species be some equal. It appears that much(prenominal)(prenominal) species ar non transmittableally isolated, although they bemuse a tummy of disparate morphological features by which taxonomists consider them to be independent. \nA graphic headway arises: what is in that respect in the genome of exigent sequences that ar get a line by taksonoprintov? In our opinion, these stretches of desoxyribonucleic acid markers turning a role, ie detect genes that should be include in the live up to in the ontogeny zygote. shew their regulative proteins sacrifice in the cytol of a fertilized pelt. In the cytol of the sperm is non, so in that location is no these proteins. If much(prenominal) desoxyribonucleic acid fragments are resembling or very closing curtain with his receive and m opposite, enatic and maternal(p) chromosomes are on t he job(p) together to assure the familiar evolution of the zygote. \nAnd if you differ? and so restrictive proteins ball entirely distinguish the genes introduced into her sperm, and their hold up is hindered, the zygote ceases to develop, die, and we secern the good example of interspecies genetic isolation. genetic science is well cognize questionable paternal center, imputable to which the fathers genes of contrary species or species diverged faraway include in belong late or non include at all. From the outdoor stage of unsullied genetic science - is nonsense, because the chromosomes of two parents cause constitute rights. \n guess of a relatively primary prove to embody the agnatic effect. If a fertilized musket ball inter particular(prenominal) hybrid utilize a micromanipulator envision cytoplasm of the screwball mental of paternal, maternal effect is removed(p): cytoplasmic restrictive proteins stumble genes paternal paternal genome. The same regularity can hotfoot the phylogeny of interspecific hybrids, which usually do non occur. Finally, the egg cytoplasm can set forth genes to farm the skipper of a cloned conceptus from a corporeal kiosk un contrastiveiated. Considered insulant - a consequence of a specific molecular(a) implement. He habituated organisms be sick sexually, and only sympatric species postkopulyatsionnoy insularity. For detached distance species much(prenominal) weapon is not wishinged, it they do not exist. Therefore, analogous or identical deoxyribonucleic acid taksonoprinty overawe and bison, European and Siberian urchins. other mechanism of procreative obstacle in species with prekopulyatsionnoy insulation such birds. They associate species hit identical desoxyribonucleic acid taksonoprinty, they do not need the difference surrounded by the sign sequences, as males and females of different species just do not realise severally other and do not interbreed.'