One origin? (viral evolution)
releech at TELUSPLANET.NET
Fri Jul 20 12:32:03 CDT 2001
Many "whole" organisms, such as insects, reproduce asexually. So, no, it is
not all based on sexual reproduction.
----- Original Message -----
From: "Thomas Lammers" <lammers at VAXA.CIS.UWOSH.EDU>
To: <TAXACOM at USOBI.ORG>
Sent: Friday, July 20, 2001 12:20 PM
Subject: Re: One origin? (viral evolution)
> At 09:54 AM 7/20/01 -0700, Curtis Clark wrote:
> >Snakes are tetrapods, even though they have no legs, because they are
> >members of the tetrapod clade, descended from the first tetrapods.
> >Likewise, eukaryotes are a clade, and eubacteria may be a clade (although
> >I know that Ken disagrees), but "prokaryotes" are a grade.
> >If a mammalian virus is a piece of mammalian DNA gone astray, it is a
> >eukaryote, and in fact it is a mammal. Viruses being what they are, they
> >have little trace of their ancestry, but I would venture that the
> >differences in gene regulation and genome structure between eubacteria
> >eukaryotes might be reflected in viral genomes, and that we could thus
> >understand their relationships.
> >"Defining" prokaryotes and eukaryotes by their nuclei is essentialist.
> >Let's instead ask what we can infer about lineage groups.
> All well and good. But I think that cladistic phylogeny carries with it
> unstated assumption that the evolutionary events it reflects are the
> of sexual reproduction of whole organisms, n'est ce pas? I do
> not believe the methodology functions well when we are dealing with bits
> of the organism that have taken on a life of their own.
> Thomas G. Lammers, Ph.D.
> Assistant Professor and Curator of the Herbarium (OSH)
> Department of Biology and Microbiology
> University of Wisconsin Oshkosh
> Oshkosh, Wisconsin 54901-8640 USA
> e-mail: lammers at uwosh.edu
> phone: 920-424-1002
> fax: 920-424-1101
> Plant systematics; classification, nomenclature, evolution, and
> biogeography of the Campanulaceae s. lat.
> "Today's mighty oak is yesterday's nut that stood his ground."
> -- Anonymous
More information about the Taxacom