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crimson-tide » crimson-tide » Ma 1ère rubrique » Domine Hommes' Out-of-Africa 'Migration

Domine Hommes' Out-of-Africa 'Migration

Les hommes etaient plus nombreux que les femmes de maniere significative dans le "out-of-Africa" migration quelques 60.000 ans que finalement peuple le reste du monde, selon une nouvelle etude.

L'Afrique est connue pour etre le berceau de l'evolution de l'homme, ainsi que des etudes recentes montrent que les peuples qui habitent d'autres continents d'aujourd'hui proviennent d'un relativement petit groupe d'Homo sapiens sapiens, qui passe a travers le Proche-Orient, en Europe et au-dela des 50000 et 70000 ans.

Mais jusqu'a present, personne n'a trouve le moyen de determiner ce que le sexe ratio de ce soi-disant fondateurs de la population aurait pu l'etre.

Un quatuor de chercheurs dirigee par Alon Keinan a la Harvard Medical School pense que le secret peut etre enfermes dans des differences dans le code genetique dans des regions geographiques distinctes.

Ils savaient que le pourcentage des chromosomes X dans une population donnee varie en fonction de la proportion des hommes.

Le "X" et "Y" chromosomes determinent le sexe - les hommes ont un chacun, tandis que les femmes ont deux chromosomes X. Les 22 autres paires de chromosomes du genome humain sont les memes.

Il etait aussi connu que ce rapport concerne le taux de mutations au hasard, qui se propagent par le chromosome X sur des dizaines ou des centaines de generations par rapport au taux de mutation dans d'autres, non-sexe, les chromosomes.

Keinan et des collegues motives que si X-chromosomes change plus rapidement que prevu, alors il est presque certainement que nos ancetres qui ont erre sur l'Afrique ont ete a predominance masculine.
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