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Dinesh

Dinesh club

Posted: 26 Nov 2023

Taken: 26 Nov 2023

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Evolution •
Triummph of an Idea •
299 •
Page •
Author •
Carl Zimmer •

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Out of Africa

Out of Africa
Fossil and genetic evidence suggest that modern humans emerged from Africa around 50,000 years ago and spread over the Old World

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 Dinesh
Dinesh club
Stringer, Wilson, and other scientists began formulating a scenario for modern humans they called “out of Africa.” As Homo spread out of Africa, they proposed, it evolved into several distinct species that did not breed with one another. Homo erectus settled across much of Asia, while Neanderthals established themselves in Europe and Near East. during this time, Homo sapiens was evolving from older hominids back in Africa. At some point, Homo sapiens migrated to Asia and Eruope. The cave paintings of Chauvet, as well as the jewellery, weap[ons, clothing, and other artifacts that turn up in the fossil record after 50,000 years ago were all made by Homo sapiens, who left them behind as they explored the world. And when Homo sapiens arrived on the territory of Homo erectus or Neanderthals, these other humans disappeared.

Geneticists who have followed up on Wilson’s initial work have generally confirmed the Out of Africa model. No matter which genes they analyze to construct the tree of human evolution. Africans consistently occupy branches that reach down closest to the base of the tree. With more sequences available to compare, mitochondrial genes now point to an origin 170,000 years ago. In the late 1990s, a team of geneticists compared the Y chromosomes of humans. Those studies indicate the modern humans date back only 50,000 years. Of course all the studies have a margin of error of ten of thousands of years, so they do not necessarily contradict one another. ~ Page 298/299
6 months ago. Edited 6 months ago.
 Dinesh
Dinesh club
Evolution - THE TRIUMPH OF AN IDEA
5 weeks ago.

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