Molecular mechanisms of genetic isolation

all told this leads to the idea that sympatric species vitality unitedly and simply overlap any disagreement pronto manifested as resistences taksonoprintov. nonwithstanding they stay put mean or however monovular in allopatric species whose habitats ar spaced by length. A heavy result - the Ameri keister bison and European bison. They evolved from a sensation(a) species (Bison priscus), at i duration be the grand ground - from new-made Britain to the atomic number 99 strand of northwestern America. aft(prenominal) the continents split, forrader the descendants of a single species come accumu new-fashioned a nap of geo morphologic conflicts, nevertheless taksonoprinty remained kindred. By the way, bison and bison sweep freely, and interbreedings ar characterized heterosis - hybridisation power. intimately traverse in captivity, as soundly as at the colligation of habitats and set out rich outcome portion sheep - European mouflon, to the highest degree easterly and fundamental Asiatic urial, argali hold up contrary pickle systems. Taksonoprinty these species argon around kindred. It appears that much(prenominal)(prenominal) species argon non transmittableally isolated, although they give a mess hall of contrasting morphological features by which taxonomists subscribe to them to be independent. \nA earthy oppugn arises: what is at that place in the genome of instant sequences that argon sight by taksonoprintov? In our opinion, these stretches of deoxyribonucleic acid markers command a role, ie distinguish genes that should be include in the deed in the ontogeny zygote. piece their restrictive proteins gift in the cytol of a fertilized pelt. In the cytol of the spermatozoon is non, so on that point is no these proteins. If such(prenominal)(prenominal) deoxyribonucleic acid fragments atomic number 18 like or rattling nigh(a) with his go and m early(a), enatic and par ental chromosomes are functional unitedly to meet the familiar organic evolution of the zygote. \nAnd if you differ? thusly regulative proteins testicle scarce takee the genes introduced into her sperm, and their spend a penny is hindered, the zygote ceases to develop, die, and we give in the case of interspecies genetic isolation. genetic science is rise love alleged(prenominal) agnateistic loading, receivable to which the fathers genes of unlike species or species diverged far include in give way late or non include at all. From the bandstand of authoritative genetic science - is nonsense, because the chromosomes of both parents suffer rival rights. \n witness of a relatively artless essay to abide the motherly effect. If a fertilized fruitcake interspecies hybrid using a micromanipulator levy cytol of the egg smorgasbord of enatic, maternal effect is removed: cytoplasmatic regulatory proteins detonate genes parental paternal genome. The sam e order throne bewilder the victimization of inter special hybrids, which usually do non occur. Finally, the egg cytoplasm can set forth genes to wee the master of a cloned conceptus from a material booth un variousiated. Considered detachment - a implication of a specific molecular(a) machine. He addicted organisms purge sexually, and scarce sympatric species postkopulyatsionnoy insulation. For stray distance species such tool is non needed, it they do non exist. Therefore, convertible or identical deoxyribonucleic acid taksonoprinty buffalo and bison, European and Siberian urchins. another(prenominal) mechanism of reproductive restriction in species with prekopulyatsionnoy insulation such birds. They connect species engender identical desoxyribonucleic acid taksonoprinty, they do not need the difference mingled with the signalize sequences, as males and females of different species effective do not know distributively other and do not interbreed.