Toți oamenii cu ochi albaștri au un singur strămoș
Ochii albaștri sunt des întâlniți în Europa, dar și în unele zone din Eurasia. În pofida răspândirii lor, oamenii de știință au demonstrat că toate persoanele cu ochi albaștri au un singur strămoș comun, care ar fi trăit în regiunea Mării Baltice, cu aproximativ 10.000 până la 6.000 de ani în urmă. Inițial, toți oamenii aveau ochii negri sau de culoare închisă. La un moment dat, a apărut o mutație genetică care a determinat deschiderea culorii irisului. Geneticianul olandez Hans Eisberg a descoperit că o anumită genă a redus procentul de melanină din iris și astfel au apărut ochii de culoare deschisă. Dacă defectul genetic ar fi eliminat complet melanina, ar fi apărut un număr mult mai mare de albinoși.
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