Re: Scientific theory

Isn't there a variation similar to this in
azaleas in the Appalachians Mountains? I seem to
remember that from Grad school in Knoxville many
years ago. The the nearby populations were able
to cross pollinate, but the distant ones were
genetically different so as to not allow
reproduction.

Wayne

--- Don Winterstein <dfwinterstein@msn.com>
wrote:

> Question: I understand you to imply that the
> definition of species involves any kind of
> "reproductive isolation." In your example, the
> isolation would be mechanical, not genetic.
> Presumably the definition would not include
> simple geographic isolation, even though
> geographic isolation is known to lead to new
> species. Correct?
>
> Don
>
> ----- Original Message -----
> From:
>
bivalve<mailto:bivalve@mail.davidson.alumlink.com>
>
> To: ASA<mailto:asa@calvin.edu>
> Sent: Monday, December 13, 2004 3:39 PM
> Subject: Re: Scientific theory
>
>
> > And that kind of change is the sort of
> thing that these people have been told about
> and are interested in: "man from ape." Can
> you make dog variations seem relevant to
> someone who doesn't accept evolution? <
>
> It would probably help to have skeletons of
> various breeds to help visualize the magnitude
> of differences that have been created, since we
> are already familiar with and thus ignore the
> external variations. One aspect of particular
> relevance is the role of neoteny in both
> creation of certain dog breeds and of humans.
> Short-faced dog breeds resemble puppies of
> other breeds in their cranial proportions.
> Similarly, the relatively large brain to body
> ratio of humans is more similar to that of very
> young apes than adult apes.
>
> Another way in which dog variation may be
> brought to relevance is to point out that if we
> were to eliminate all the middle-sized dogs,
> there would be reproductive isolation between,
> e.g. chihuahuas and St. Bernards. This would
> create of separate species, something which is
> denied by some antievolutionists despite the
> many known examples.
>
>
> Dr. David Campbell
> Old Seashells
> University of Alabama
> Biodiversity & Systematics
> Dept. Biological Sciences
> Box 870345
> Tuscaloosa, AL 35487-0345 USA
>
>
bivalve@mail.davidson.alumlink.com<mailto:bivalve@mail.davidson.alumlink.com>
>
> That is Uncle Joe, taken in the masonic
> regalia of a Grand Exalted Periwinkle of the
> Mystic Order of Whelks-P.G. Wodehouse, Romance
> at Droitgate Spa
>
>

                
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Received on Mon Dec 20 12:40:23 2004