Was: Woese Now: Origin of life and Karl Popper

Curtis Clark jcclark at CSUPOMONA.EDU
Mon Oct 20 19:12:25 CDT 1997

At 08:15 PM 10/20/97 -0200, Thomas Schlemmermeyer wrote:
>So what about this tree of evolution, formulated by Popper in
>Is it today possible to decide how many different forms or
groups exactly gave rise to evolution?

It is clear to me that all organisms alive on earth today have a
common origin: they all share the synapomorphy of the genetic
code. I've heard no evidence that the actual genetic code is in
any way adaptively superior to any other possible genetic code,
so parallel evolution of identical codes seems unlikely. Thus,
the parsimonious explanation is that all living organisms come
from the first organism (or population of organisms) to have the
genetic code that we know today.

Curtis Clark         http://www.intranet.csupomona.edu/~jcclark/
Biological Sciences Department             Voice: (909) 869-4062
California State Polytechnic University      FAX: (909) 869-4078
Pomona CA 91768-4032  USA                  jcclark at csupomona.edu

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