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Chapter category: Evolution

On the Evolution of Humans

Chapter authors:
Christian Schwabe


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Ancient bones are somewhat like wind vanes that show from which direction a particular hypothesis breezes across the fossil field. If a paradigm is useful one should be able to predict what will be found at the end of the projected course. This means that one can put a general evolutionary hypothesis like a grid over the pattern of evidence and see how fossils and expectations match. In the standard model predictions are not possible because the phenotype lattice radiates from one spot (the common ancestor) with every beam studded with chance-initiated branch points that give rise to unpredictable patterns.1 By rules of the Genomic Potential Hypothesis the future position of a species in the hierarchy of taxa is, in principle, predictable. The discussion of our own past will reflect this fundamental change in philosophy.

The human brain is monstrous even if compared to our closest competitor, the great ape, but our truly unique property is the physiological (as opposed to habitual) upright walk which includes special anatomical features such as a narrow pelvis, the slightly inward-directed thigh bones, and plantigrade feet.2, 3 Upright-walking species show a foramen occipitalae at the base of the skull rather than the posterior aspect. These are unmistakable markers that are readily recognized in the fossilized form. Anthropologists will always be looking for ancestors that do not show these features because the old school says that the upright walk developed slowly from a quadruped animal by gene duplication and mutations. That proposal is of beguiling simplicity if one forgets the biology and biochemistry required for that transition. Looking back in time one is faced with the fact that the brain had all but disappeared at Lucy’s (A.afarensis) developmental stage, yet she was fully bipedal.4 To find the presumed quadruped ancestor would lead to insurmountable identification problems unless, as shown in a cartoon by an unknown artist, step-less melting of one form into the other can be observed.

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