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Hominid evolution: genetics versus memetics

Published online by Cambridge University Press:  09 September 2011

Brandon Carter
Brandon Carter
Affiliation:
LuTh, Observatoire de Paris, CNRS 92195, Meudon, France. e-mail: [email protected]
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Abstract

The last few million years on planet Earth have witnessed two remarkable phases of hominid development, starting with a phase of biological evolution characterized by rather rapid increase of the size of the brain. This has been followed by a phase of even more rapid technological evolution and concomitant expansion of the size of the population that began when our own particular ‘sapiens’ species emerged, just a few hundred thousand years ago. The present investigation exploits the analogy between the neo-Darwinian genetic evolution mechanism governing the first phase, and the memetic evolution mechanism governing the second phase. From the outset of the latter until very recently – about the year 2000 – the growth of the global population N was roughly governed by an equation of the form dN/Ndt=N/T*, in which T* is a coefficient introduced (in 1960) by von Foerster, who evaluated it empirically as about 200 000 million years. It is shown here how the value of this hitherto mysterious timescale governing the memetic phase is explicable in terms of what happened in the preceding genetic phase. The outcome is that the order of magnitude of the Foerster timescale can be accounted for as the product of the relevant (human) generation timescale, about 20 years, with the number of bits of information in the genome, of the order of 10 000 million. Whereas the origin of our ‘homo’ genus may well have involved an evolutionary hard step, it transpires that the emergence of our particular ‘sapiens’ species was rather an automatic process.

Keywords

hominidhomo sapiensevolutionmemegenegenome
Type
Research Article
Information
International Journal of Astrobiology , Volume 11 , Issue 1 , January 2012 , pp. 3 - 13
Copyright
Copyright © Cambridge University Press 2011

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References

Bostrom, N. (2002). Anthropic Bias. Routlege, New York.Google Scholar
Bourgeois-Pichat, J. (1988). Du XXe au XXIe siecle: l'Europe et sa population après l'an 2000. Population 43, 9–44.Google Scholar
Biraben, J-N. (2003). The rising numbers of humankind. Popul. Soc. 394, 1–4.Google Scholar
Carter, B. (1983). The anthropic principle and its implications for biological evolution. Phil. Trans. R. Soc. Lond. A 310, 347–363.Google Scholar
Carter, B. (2008). Five or six step scenario for evolution? Int. J. Astrobiol. 7, 177–182 [arXiv:0711.1985].CrossRefGoogle Scholar
Catton, W.P. (1980). Overshoot: The Ecological Basis of Revolutionary Change. Illinois University Press, Urbana.Google Scholar
Cook, R.C. (1962). ‘How many people have lived on Earth?, Popul. Bull. 18, 1–19.Google Scholar
Dawkins, R. (1976). The Selfish Gene. Oxford University Press, Oxford.Google Scholar
Dawkins, R. (2004). The Ancestor's Tale. Houghton Mifflin, New York.Google Scholar
Falk, D. (1998). ‘Hominid brain evolution: looks can be deceiving’. Science 280, 1714.CrossRefGoogle ScholarPubMed
Gott, J.R. (1993). ‘Implications of the Copernican pronciple for our future prospects’. Nature 363, 315–319.CrossRefGoogle Scholar
Gillespie, J.M. (2004). Population Genetics. John Hopkins University Press, Baltimore.CrossRefGoogle Scholar
Holloway, R.L. (2001). ‘Evolution of Brain’. In International Encyclopaedia of the Social and Behavioural Siences. 2, pp. 1338–1345. Elsevier Sciences, Oxford.CrossRefGoogle Scholar
Koratayev, A. (2005). ‘A compact macromodel of world system evolution’. J. World-Syst. Res. IX, 79–93.CrossRefGoogle Scholar
Kremer, M. (1993). ‘Population growth and technological change: one million B.C. to 1990’. Q. J. Econ. 108, 681–716.CrossRefGoogle Scholar
Leslie, J. (1996). The End of the World. Routledge, London.Google Scholar
Maynard Smith, J. (1989). Evolutionary Genetics. Oxford University Press, Oxford.Google Scholar
McCabe, M. & Lucas, H. (2010). ‘On the origin and evolution of life in the Galaxy’. Int. J. Astrobiol. 9, 217–226.CrossRefGoogle Scholar
Renfrew, C. (2008). ‘Neuroscience, evolution, and the sapient paradox.’. Phil. Trans. R. Soc. B363, 2041–2047.CrossRefGoogle Scholar
Shute, N. (1957). On the Beach. Ballantine, New York.Google Scholar
U.N. Population Division (1999). The World at Six Billion. U.N. Population Division, New York.Google Scholar
von Foerster, H., Mora, P. & Amiot, L. (1960). ‘Doomsday: Friday November 13th A.D. 2026’. Science 132, 1291–1295.CrossRefGoogle Scholar
von Hoerner, S.J. (1975). ‘Population explosion and interstellar expansion’. J. Br. Interplanet. Soc. 28, 691–712.Google Scholar
Wade, N. (2007). Before the Dawn. Duckworth, London.Google Scholar
Watson, A.J. (2008). ‘Implications of an anthropic model of evolution for emergence of complex life and intelligence’. Astrobiology 8, 175–185.CrossRefGoogle ScholarPubMed
Wells, J. (2009). Apocalypse When? Springer-Praxis, Berlin.CrossRefGoogle Scholar