[Taxacom] (no subject)

John Grehan calabar.john at gmail.com
Thu Mar 7 05:31:27 CST 2013

Not speaking for Mike to whom the question was directed, I would agree that
there is a difference between the frequency of polymorphisms through
selection and the evolutionary origin of those polymorphisms. The molecular
geneticist Dover suggested that 'molecular drive' mechanisms (including
biased gene conversion) and natural selection represented two mechanisms
for 'improbable' change and that these mechanisms existed in a dynamic
relationship. It does seem that studies in developmental genetics are
pointing to molecular drive mechanisms underlying much, if not most, of the
structural organization of life. Jeffrey Schwartz once noted that
developmental geneticists often generate work demonstrating the importance
of genetic mechanisms for evolution, but when they transfer these models
into an evolutionary context they just fall back on simplistic selection

John Grehan

On Thu, Mar 7, 2013 at 9:07 PM, Rob Smissen <SmissenR at landcareresearch.co.nz
> wrote:

> Hi y'all
> I think Micahael is quite correct that hair on snails or any other trait
> of an organism might have nothing to do with any purpose/end/advantage. And
> I agree whole heartedly that genomic change is not well modelled as random,
> and that genetic polymorphism is not unlimited and unconstrained.
> However, I do think that selection plays an important role in determining
> which polymorphisms (however they arise) are maintained within populations.
> Michael are you arguing that all evolution is the result of prior trends
> in genomes unmediated by selection, the majority, or just some stuff here
> and there?
> cheers
> Rob
> ________________________________
> Please consider the environment before printing this email
> Warning: This electronic message together with any attachments is
> confidential. If you receive it in error: (i) you must not read, use,
> disclose, copy or retain it; (ii) please contact the sender immediately by
> reply email and then delete the emails.
> The views expressed in this email may not be those of Landcare Research
> New Zealand Limited. http://www.landcareresearch.co.nz
> _______________________________________________
> Taxacom Mailing List
> Taxacom at mailman.nhm.ku.edu
> http://mailman.nhm.ku.edu/mailman/listinfo/taxacom
> The Taxacom Archive back to 1992 may be searched with either of these
> methods:
> (1) by visiting http://taxacom.markmail.org
> (2) a Google search specified as:  site:
> mailman.nhm.ku.edu/pipermail/taxacom  your search terms here
> Celebrating 26 years of Taxacom in 2013.

More information about the Taxacom mailing list