Added: 24-04-2011 09:14:33

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In the final episode, Roberts describes theories about how humans traversed from Asia to the Americas, asking how they achieved it during the Ice Age, when the route to North America was blocked by ice walls. She describes the traditional theory that the first Americans were the Clovis culture, who arrived through an ice-free corridor during the end of the Ice Age 13,000 years ago. However, she then visits archaeological sites in Texas, Brazil, the Californian Channel Islands and Monte Verde in southern Chile which show 14,000 year old human remains, proving that humans must have arrived earlier via a different route. She shows the skull of the Luzia Woman, found in Brazil, which displays Australasian features rather than the East Asian features of modern day Native Americans; an archaeologist explains that these first Americans may have been Asians who migrated before Asians developed their distinctive facial features. Roberts shows that the earliest Americans may have migrated down the relatively ice-free western coastlines of North and South America. She concludes by noting that when Europeans arrived in 1492, they did not recognise Native Americans as fully human, but modern genetics and archaeology proves that we all ultimately descend from Africans.

Tags: BBC Ancestor Human Biology Darwin Evolution Fossils Gene

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