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Mal'ta boy was already partial Mongoloid himself. It is unlikely R1b came from Malta boy because they had mtDNA U instead of X. There was no European or caucasoid skull found in Americas.
A theory suggest that the Amerindians who migrated to Americas already had such dna. Both pure Siberian Mongoloid and mix Siberian Mongoloid like today siberia migrate to Americas. However it must be mentioned that the original siberian population looked more like Amerindians before the ice age changed the siberian mongoloid with east asian features.
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