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SV: Watery evolution of man?

On the other hand there are studies of the phylogeny of head lice and crabs 
that suggests that head hair and pubic hair were already ecologically isolated 
"islands" by 3.3 MY BP.

The 240 kya figure seems reasonable, but 70 kya seems extremely unlikely. At 
that time Homo sapiens was already dispersed at least over all of Africa and 
southern and eastern Asia. Is there any other example of a genetic change that 
young that has spread to 100% of all human populations everywhere? 

Tommy Tyrberg

-----Ursprungligt meddelande-----
FrÃn: owner-DINOSAUR@usc.edu [mailto:owner-DINOSAUR@usc.edu] FÃr T. Michael 
Skickat: den 11 januari 2008 06:58
Till: Dinosaur Mailing List
Ãmne: Re: Watery evolution of man?

On Jan 10, 2008 9:34 PM, Richard W. Travsky <rtravsky@uwyo.edu> wrote:
> On Thu, 10 Jan 2008, T. Michael Keesey wrote:
> >
> > Again, the problem here is that "hairlessness" seems to have arisen
> > quite recently in our ancestry. This would basically require archaic
> Work with lice that afflict humans suggests maybe 70kya

Do you have a reference for that?

I was going by the 240kya figure in:

Winter, H., L. Langbein, M. Krawcazk, D. N. Cooper, L. F. Jave-Suarez,
M. A. Rogers, S. Praetzel, P. J. Heidt, J. Schweizer. 2001. Human type
I hair keratin pseudogene ÏhHaA has functional orthologs in the
chimpanzee and gorilla: evidence for recent inactivation of the human
gene after the Pan-Homo divergence. Hum. Genet. 1088:37-42.

Of course, the trait probably did develop gradually (in fact, it's
still rather variable). And both of these dates are really, really

T. Michael Keesey
Director of Technology
Exopolis, Inc.
2894 Rowena Avenue Ste. B
Los Angeles, California 90039