Kuongororwa kutsva kweDNA kwakapatsanuka kubva pazvirimo zvekare zvembaro zvakaratidza kuti vaidzivirirwa muSiberia vangangosvika zviuru makumi maviri zvemakore apfuura. Kubva pano, ivo vakatambanudza kumavirazuva uye kumabvazuva, pamwe chete nevatenzi vavo vachangowana vakayambuka chando chando chikawedzera chando chakasvika uye vakapinda muAmerica. Mufananidzo wakadaro unorondedzera vanyori vechinyorwa chitsva chakaburitswa mumagazini yePNAS.
Muchokwadi, imbwa dzakava mhuka dzekutanga dzakatangira, asi zvakawanda zvakavanzika zvezviitiko izvi zvinoramba zvakavanzika. Mwana wavo anovhiringidzika zvekuti kuedza kwekuedza kwakatangira vanhu vekutanga veimba kunoratidza kuti china zviuru makumi matatu apfuura, uye dzimwe nyanzvi dzinotenda kuti mhumhi hwepedyo hwakaitika kupfuura kamwe chete.
Dambudziko nderekuti nyanzvi dzinowanzogona kusiyanisa zvakasara zvembwa dzakatarwa kubva kumapere, izvo zvavainge zvisina kunyanya kusiyana neasiromically kana genetic. Naizvozvo, vanyori vebasa idzva vaiona kushanduka-genetic dzevira dzevira kufanana nedzimwe shanduko yakafanana yevagari vekare veSiberia, Beresia neNorth America. Masayendisiti akawana kuti mapoka ekutanga evavhimi veimbwa akaoneka mune chiedza chitsva makore angangoita zviuru gumi zvemakore apfuura, uye prehistory yavo inogona kuteedzerwa kusvika Siberia, makore makumi maviri nemasere apfuura.
Yakanga iri nguva yekukwana kwekupedzisira glacation, apo iyo yese inotariswa dunhu riripo risinganyanye kufadza kwehupenyu, kutonhora uye kuoma. Yaive mamiriro aya anogona kumanikidza vanhu mapumvu ekuramba vari pedyo nevanhu kuti vawane mafupa uye mubatanidzwa, uye nekushingaira navo. Nekufamba kwenguva, izvi zvakakonzera kukura kwehukama hwepedyo uye kushandurwa kwevakadzivirirwa mhuka dzesango mumhuka nyowani, dzakatove dzakatangwa.
Kubva apa, kugaramo kwavo kwakatanga kumadokero uye kumabvazuva, kusvika kuAmerica. "Isu tine nguva refu kuti vanhu vekutanga vemazano vakatovandudza hunyanzvi hwekuvhima, kugadzirwa kwebwe uye zvimwe zvinhu zvakagadzirirwa zvizere," anodaro David melzzer shanda. "Imbwa dzakavaperekedza kubva pakuonekwa kwenyika itsva zvachose inogona kuve yakafanana chikamu chetsika iyi, semidziyo yematombo ayo vanhu vakatakura matombo."
Kunobva: Naked Science