Molecular taxonomy: on way out?

Richard.Zander at MOBOT.ORG Richard.Zander at MOBOT.ORG
Thu Jul 21 13:05:55 CDT 2005

Hang on, now. It's the interrelationships of the genes, promoters,
regulators, and whatnot that determine the phenotype which is the focus of
evolutionary selection. I get an implication from your sentence (below),
Les, that ALL available information is now relatively accessible.
Phylogenetic analyses that evaluate accumulations of mutations in junk DNA
may not be tracking phenotypic expressions of variously regulated exons.
Interrelationships ("phenomics") are hardly relatively accessible at the
present time.

This paper:

Collin, R. & R. Cipriani. 2003. Dollo's law and the re-evolution of shell
coiling. Proc. R. Soc. Lond. B 270: 2551--2555.

demonstrates that massive homoplasy may not be incremental in accumulation.
It's an important paper and may be of help to those who can't deal with very
well supported molecular evidence that contradicts well-supported
mult-character morphological relationships.

Richard H. Zander
Bryology Group, Missouri Botanical Garden
PO Box 299, St. Louis, MO 63166-0299 USA
richard.zander at <mailto:richard.zander at>
Voice: 314-577-5180;  Fax: 314-577-9595
Bryophyte Volumes of Flora of North America:
Res Botanica:
Shipping address for UPS, etc.:
Missouri Botanical Garden
4344 Shaw Blvd.
St. Louis, MO 63110 USA

-----Original Message-----
From: Les Watson [mailto:leswatson at WESTNET.COM.AU]
Sent: Thursday, July 21, 2005 4:31 AM
Subject: Re: [TAXACOM] Molecular taxonomy: on way out?

You may well be right, especially re "the current systematic
approaches"; but total DNA extracts contain ALL the available
information for extant organisms, in relatively accessible form.

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