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- Newsgroups: talk.origins
- Path: sparky!uunet!microsoft!wingnut!russpj
- From: russpj@microsoft.com (Russ Paul-Jones)
- Subject: Re: Topic for Discussion?
- Message-ID: <1993Jan28.184142.9556@microsoft.com>
- Date: 28 Jan 93 18:41:42 GMT
- Organization: Microsoft Corporation
- References: <1993Jan26.083653.9970@smds.com> <1k5cffINNc6s@fido.asd.sgi.com> <1k66f2INNqdh@moe.ksu.ksu.edu>
- Lines: 44
-
- In article <1k66f2INNqdh@moe.ksu.ksu.edu> jsanders@phys.ksu.edu (Justin M. Sanders) writes:
- >
- >You (Jon) in that case would have to argue that there exists at least
- >one viable path connecting two "kinds" (where "kind" is some pair of
- >taxa that you and the creationist agree are distinct).
-
- Isn't this graph notion a little ridiculous, at least from a practical
- standpoint? I mean, I don't think we know exactly what the nodes are
- (possible, viable species?) or the edges ("small enough" steps between
- species?). And we're nowhere near being able to define either of those
- terms. Yes, as a visual aid to explain that either we are all connected
- by edges of this sort or we're not, great, but not as arguments for
- either side.
-
- Yes, I would be very pleased with a demonstration of a series of steps
- linking the DNA of a duck with a weasel, each step being "small enough"
- and each intermediate instance of DNA being able to produce a viable
- critter in at least one environment. Unfortunately, this exercise
- would not establish that that change had indeed happened, or that it
- could for any other pair of critters. Even if Jon could show that
- each intermediate critter was viable and relatively successful
- (moreso than it's immediate DNA neighbors, say) for the environment
- he could prove existed at the time the critter was around (much more
- difficult), he would still not have shown that that sequence happened.
-
- So, perhaps for the time being the "limits of micro-evolution" will remain
- a loud dispute between those who see no limits and those who can't be
- convinced of the non-existence of those limits. But there are indirect
- methods.
-
- Competing theories of macro-evolution must be judged on their power in
- predicting what we do observe. Macro-evolution has a wealth of data from
- many areas: morpholigical studies of existing species, the fossil record,
- genetic data, etc. Establish the claims of the competing theories, and
- examine the evidence for support or denial of these claims.
-
- >--
- >Justin M. Sanders "As the grandest mill in the world will not
- >Dept. of Physics extract wheat-flour from peascods, so pages
- >Kansas State Univ. of formulae will not get a definite result
- >Manhattan, KS from loose data." -- T.H. Huxley
-
- -Russ Paul-Jones
- russpj@microsoft.com
-