Kusanthula kwatsopano kwa DNA kudera kwa agalu kumawonetsa kuti anali olamulidwa ku Siberia zaka 23 zapitazo. Kuchokera apa, adafalikira kumadzulo ndi kummawa, pamodzi ndi ambuye awo omwe adapeza kumene adawoloka zowawa pamenepo ndikulowa ku America. Chithunzi choterechi chikufotokoza zomwe adalemba a nkhani yatsopano yomwe yatulutsidwa mu magazini ya PNAS.
M'malo mwake, agalu adakhala nyama zapakhomo, koma zambiri za njirayi zimakhala chinsinsi. Ndodzu yawo lero ndi yosokonezeka kwambiri yomwe ikukhudzana ndi kuchuluka kwa anthu omwe ali pabanja omwe amawonetsa kuti China zaka zikwi ziwiri mpaka 30 zapitazo omwe adakhulupirira kuti amalitsidwa ndalama zoposa kamodzi.
Vuto ndiloti akatswiri nthawi zambiri satha kusiyanitsa mabwinja a agalu a Plasticne kuchokera ku mimbulu, omwe sanali osiyana kwambiri ndi anatomical kapena jinkoma. Chifukwa chake, olemba ntchito yatsopanoyo ankaganiza kuti chisinthiko cha agalu ofanana ndi chisinthiko chofananacho ndi kusinthika kwa anthu a Siberia, Berimia ndi North America. Asayansi apeza kuti magulu oyamba a osaka agalu adawoneka m'kuwala kwatsopano zaka 15,000 zapitazo, ndipo kuti kusangalalira kwawo kumatha kutsatiridwa mpaka Siberia, zaka 22.8 zaka chikwi zapitazo.
Inali nthawi yayitali kwambiri yomaliza, pomwe dera lonselo silinakhale losavomerezeka m'moyo, ozizira komanso youma. Zinali zofunikira izi zomwe zingakakamize kuchuluka kwa mimbulu kuti ziyandikire anthu kuti apeze mafupa ndi mgwirizano, komanso kucheza nawo mwachangu. Popita nthawi, izi zidapangitsa kuti pakhale ubale wapafupi komanso kusintha kwa nyama zonyansa zatsopano, nyama zapakhomo kale.
Kuchokera apa, malo awo adayamba kumadzulo ndi kummawa, mpaka ku America. "Tadziwa kuti anthu oyamba kumene anthu oyambirirawa atukuka kale zaukadaulo wambiri wokasaka, zida zina komanso zidakonzedwa ndi zida zatsopano," akutero a David Meltzer (David Meltzer), m'modzi mwa olemba atsopano ntchito. "Agalu omwe amapita nawo limodzi ndi mawonekedwe omwe dziko latsopano kwathunthu ndilokhoza kukhala gawo lofananalo la chikhalidwe ichi, ngati zida zamiyala."
Source: Sayansi yamanyazi