Sostanzialmente non posso far altro che quotare le parole di Marco, quantomai sintetico e chiaro
Tuttavia vorrei ribadire che l'interpretazione dei dati genetici è molto difficile e che le voci discordanti non mancano; ad esempio j. HawKs delll'Università del Wisconsin;a questo link
Scientist: Human Origin Impossible to Pinpoint | LiveScience
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In his own research, Hawks is finding that
natural selection has led to changes in thousands of genes during only the past few thousand years.
“I’m really thinking just the opposite of this paper,” Hawks said. “There are differences in the skull between populations, including their variability, but it is mostly due to very recent effects and not the origin of modern humans.”
At the end of the day, a resolution to the "Out of Africa" debate may be impossible, he said. Most of the evidence can be interpreted as supporting both human-origins theories. “It’s really hard to find observations that distinguish the two,” Hawks said.
“The multiregional idea is identical to the recent African origin idea, except for its prediction that Europeans and Asians were part of the single population of origin and didn’t become extinct.”