Bonke abantu blue uneso bahlanganiswe into eyodwa

Kukhona umbono wokuthi abantu blue uneso sinokhokho oyedwa. Kubo kuyinto European lasendulo, ogama yobudala iminyaka eyisithupha ayizinkulungwane eziyishumi. Wayethole kuguquka ngezakhi zofuzo, ngenxa okuyinto kwaba khona omunye umdwebo iris.

What esihlanganisa jikelele blue uneso

Ekuqaleni, bonke abantu babe brown okotshani. Kodwa-ke izinguquko ezihlukahlukene zofuzo, kuhlanganise lezo eziphathelene isakhi sofuzo OCA2, okwaholela ukuvela shades ezahlukene ensundu. Ngokusekelwe kulezi idatha, abacwaningi ezazizama ukuyithola umthombo lo mbala, okuyinto unomthwalo amehlo aluhlaza ukukhubazeka kwezakhi ezithile zofuzo OCA2, kodwa kwanhlanga zimuka nomoya.

muva ososayensi zathola: imbangela abantu blue uneso itholakala HERC2 engumakhelwane zofuzo. Lokho isakhi sofuzo OCA2 ebheka lemali melanin (sombala brown), akukho ukusebenza ngomhla ka-coloration iris ukuze okwesibhakabhaka. Ososayensi bakholelwa ukuthi leli kuguquka iphutha lokuqala lapho kwakukhona ukuthuthela kwamanye amazwe kwenqwaba yabantu esuka Afrika ukuze bangene eYurophu. Okungenzeka ukuphakamisa ukuthi abantu onamehlo aluhlaza - inzalo ka baseYurophu abaphila endulo.

Lo mbono kuqinisekiswa yokuthi zonke abantu blue uneso abe kuguquka efanayo. Akukona ukudalula ubuntu ukuthi kukhokho oyedwa.

Izazi zemivubukulo ziye zathola skeleton eNorth of Spain, okwadingeka unamehlo aluhlaza. Ubudala skeleton - iminyaka 7000. Ngokwemvelo, amehlo kwatholakala, kodwa ukuhlaziywa zofuzo wafakazela ukuthi kukhona izinto ngokuguqula izakhi, ukuthi ne-iris ngesineke okwesibhakabhaka.