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Re: Mice given bat-like forelimbs through gene switch



----- Original Message -----
From: "Tim Williams" <twilliams_alpha@hotmail.com>
Sent: Sunday, January 20, 2008 11:16 PM

Most prokaryote (bacteria + archaea) taxonomy is quantitative, and based on the degree of similarity (sequence homology) of the 16S rRNA gene.

So there are still molecular biologists who call similarity "homology"... no, people. No. That's not what homology means.


Prokaryote taxonomy does follow a clade system to some degree. Classification is based on the sequence homology of the 16S rRNA genes.

So it's phenetic, not cladistic. Is that what you want to say?

Aside from that, the concept of 'clade' doesn't really hold for bacteria and archaea, given the propensity of interspecific gene transfer.

Oh, lateral gene transfer doesn't make the concept inapplicable. It merely complicates the issue: clades are no longer either nested or mutually exclusive.


Even the PhyloCode deals with this: Note 2.1.3 http://www.ohiou.edu/phylocode/art1-3.html, Article 16 http://www.ohiou.edu/phylocode/art16.html... hey, wait. I thought there was a statement that lateral gene transfer does not constitute hybridization?