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The Origin and Evolution of Man

Published online by Cambridge University Press:  02 April 2024

Yves Coppens
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Extract

In order to tell the story of Man and understand our emergence better, we can readily follow on from Heinz Tobien, though we do not need to go back so far in time - just a few million years.

Clearly, our fundamental origin is animal. Thus it is easy to understand that in the great genealogy (known as phylogeny), there was one vital (geological) moment when our line was forever detached from the animal “kingdom.” The evidence of palaeontology, like that of molecular biology, today locates this point - which is, by definition, the very point of origin of our family, the hominids - in Eastern Africa around 8 million years ago. In order to state this, palaeontology rests on two sets of results. All the most ancient hominids, without exception, are East African, and the oldest of all goes back more than 7 million years. Through the study of various characteristics of the cells of contemporary primates, having arranged them in an order of increasing complexity and having hypothesized that this contemporary complexity may be a reflection of that which developed through time, molecular biology has, on the basis of palaeontological dating, calibrated this transformation and its different stages and constructed what is called a molecular clock. In this way, it has arrived at two conclusions. The primates closest to Man are by far the great African apes (chimpanzees, gorillas), and the “distance” that separates us - in other words the degree of difference that exists between them and us - situates the divergence of our two branches at just over 7 million years.

Type
Research Article
Information
Diogenes , Volume 39 , Issue 155 , September 1991 , pp. 111 - 134
Copyright
Copyright © 1991 Fédération Internationale des Sociétés de Philosophie / International Federation of Philosophical Societies (FISP)

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