Re: For Kim G. S. Øyhus


"John Harshman" <jharshman.diespamdie@xxxxxxxxxxx> wrote in message
news:O0QBf.16531$Yu.13239@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Glenn wrote:
>
> [snip]
>
> >
> > Sean, this may be of interest to you. Perhaps you have not seen it
in
> > the news.
> >
> > http://ucsdnews.ucsd.edu/newsrel/science/mcirreversible.asp
> >
> > "UCSD Biologists Find New Evidence for One-Way Evolution"
> >
> > [...]
> > "This is the strongest evidence yet to support irreversibility,"
said
> > Joshua Kohn, an associate professor of biology at UCSD who headed
the
> > study. "If we had not used the genetic data coding for this
> > reproductive mechanism and only inferred the pattern of evolution
> > based on the traits of living species, we would have come to the
> > opposite conclusion and with high statistical support - that the
trait
> > evolved more than once."
> >
> > [...]
> >
> > "Irreversible loss of complex traits, which result from the
combined
> > interaction of several genes, is an old and at times controversial
> > scientific question. While the late evolutionary biologist Stephen
Jay
> > Gould popularized the hypothesis of irreversibility, known as
Dollo's
> > Law, studies that use current methods to reconstruct the evolution
of
> > complex traits often fail to support it. This is because it is
often
> > difficult to reconstruct characteristics of extinct ancestors with
any
> > certainty."
> >
> > "The study contradicts earlier studies of complex trait evolution,
> > which have tended to favor multiple reappearances of complex
traits
> > after these organs were lost in ancestral species. The authors
suggest
> > that traditional methods for reconstructing the history of trait
> > evolution may be inaccurate."
>
> Interesting study. Why do you think it's relevant to what Sean is
> talking about?
>
Why do you think I think it is relevant to what Sean is "talking
about"?

.

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