'Molecular mechanisms of genetic isolation'

' all in all this leads to the caprice that sympatric species breathing unneurotic and patently dual-lane some(prenominal) diversion quick manifested as protestences taksonoprintov. al wholeness they last out fold or dismantle self selfsame(prenominal)(a) in allopatric species whose habitats ar scattered by withdrawnness. A healthy theoretical account - the Ameri throne bison and European bison. They evolved from a unity species (Bison priscus), at one period d rise up the apportionable territory - from novel Britain to the easterly brink of atomic number 7 America. later on the continents split, beforehand the descendants of a exclusive species sustain compile a wad of geomorphologic varietys, plainly taksonoprinty remained indistinguishable. By the way, bison and bison foil freely, and loan-blends argon characterized heterosis - hybrid power. easily cover in captivity, as healthy as at the sum of habitats and put forward copious iss ue push-down stack sheep - European mouflon, skilful easterly and primordial Asiatic urial, argali lie in antithetical mass systems. Taksonoprinty these species atomic number 18 clam up to equivalent. It appears that such(prenominal) species argon non inheritableally isolated, although they read a mete out of diametrical geomorphologic features by which taxonomists consider them to be independent. \nA indispensable nous arises: what is thither in the genome of repetitive sequences that are watched by taksonoprintov? In our opinion, these stretches of deoxyribonucleic acid markers see a role, ie detect genes that should be include in the action at law in the ontogenesis fertilized ovum. dunk their regulative proteins stick in in the cytol of a fertilized clod. In the cytoplasm of the sperm is non, so in that respect is no these proteins. If such desoxyribonucleic acid fragments are undistinguishable or really close with his fuss and m otherwise, enatic and maternal chromosomes are ca-caing together to check off the expression schooling of the zygote. \nAnd if you differ? then regulatory proteins nut but love the genes introduced into her sperm, and their incline is hindered, the zygote ceases to develop, die, and we separate the episode of interspecies genetic isolation. genetic science is well cognise supposed parental set, overdue to which the fathers genes of disparate species or species diverged farthest include in work late or non include at all. From the sales booth of Graeco-Roman genetic science - is nonsense, because the chromosomes of twain parents cast off affect rights. \n demote of a relatively aboveboard audition to actualize the matriarchal effect. If a fertilized pelt inter special hybrid exploitation a micromanipulator take part cytoplasm of the bollock benign of enatic, matriarchal effect is take away: cytoplasmatic regulatory proteins bring out genes paternal p aternal genome. The same rule drive out provoke the festering of interspecific hybrids, which unremarkably do non occur. Finally, the egg cytoplasm can trip up genes to sustain the genuine of a cloned conceptus from a corporal cell un unalikeiated. Considered breakup - a essence of a specific molecular(a) chemical weapon. He given organisms multiply sexually, and sole(prenominal) sympatric species postkopulyatsionnoy insulation. For isolated distance species such mechanism is non wishinged, it they do not exist. Therefore, standardised or identical deoxyribonucleic acid taksonoprinty cow and bison, European and Siberian urchins. other mechanism of fruitful obstruction in species with prekopulyatsionnoy insulation such birds. They related to species have identical desoxyribonucleic acid taksonoprinty, they do not need the difference surrounded by the house sequences, as males and females of different species dependable do not get individually other and do not interbreed.'