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Variations of the Theory

"The current mainstream system of classification is the three-domain system. The common consensus is that Archaea and Eukaryota evolved on a seperate branch from Bacteria, with the root of life lying somewhere in between. This branch is Neomura. However, Cavalier-Smith has postulated that Bacteria is in fact paraphyletic to Neomura, meaning that Neomura evolved from Bacteria. According to this theory, Neomura is a group which evolved from Gram-positive bacteria, this transition being marked by twenty evolutionary adaptions, which accompanied, or derived from, two other important adaptions: the development of histones to replace DNA gyrase, and the loss of peptidoglycan cell walls to be replaced by other glycoproteins."

This is confusing because it's worded too technically. Rather than seeming to contradict what has just been said, you should start out by simply saying that Cavalier-Smith theorizes that the Archaebacteria and Eukaryotia arose from the Neomura which arose from the gram positive bacteria bacteria. You can then go on to say that the Bacteria are paraphyletic without the Neomura, but this phrasing used is rather awkward. I can't correct it without the article handy. I just can't seem to see what the second sentence is saying, so it's impossible to correct. I would simply like to see this clarified first, inserted into the article later. I don't have the article handy, but will try my best to read and understand as much as possible. KP Botany 19:00, 2 June 2007 (UTC)[reply]

It's not correct to say the Archaea and Eukaryota arose from the Neomura; they each are part of Neomura. (It's like saying that Primata evolved from Mammalia.) If the hypothesis that Archaea and Eukaryota form a clade is correct then there are three alternative sub-hypotheses: either both evolved from stem Neomura (Cavalier-Smith's hypothesis, but there may be others), or Eukaryota evolved from Archaea (making Archaea paraphyletic), or Archaea evolved from Eukaryota (making Eukaryota paraphyletic). (The last doesn't seem very likely.) Lavateraguy 21:22, 2 June 2007 (UTC)[reply]

Revision as of 19:01, 2 June 2007 edit KP Botany (talk \| contribs) Extended confirmed users 10,588 edits m →Variations of the Theory: "" ← Previous edit		Revision as of 21:22, 2 June 2007 edit undo Lavateraguy (talk \| contribs) Autopatrolled, Extended confirmed users 11,587 edits No edit summary Next edit →
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	This is confusing because it's worded too technically. Rather than seeming to contradict what has just been said, you should start out by simply saying that Cavalier-Smith theorizes that the Archaebacteria and Eukaryotia arose from the Neomura which arose from the gram positive bacteria bacteria. You can then go on to say that the Bacteria are paraphyletic without the Neomura, but this phrasing used is rather awkward. I can't correct it without the article handy. I just can't seem to see what the second sentence is saying, so it's impossible to correct. I would simply like to see this clarified first, inserted into the article later. I don't have the article handy, but will try my best to read and understand as much as possible. [[User:KP Botany\|KP Botany]] 19:00, 2 June 2007 (UTC)		This is confusing because it's worded too technically. Rather than seeming to contradict what has just been said, you should start out by simply saying that Cavalier-Smith theorizes that the Archaebacteria and Eukaryotia arose from the Neomura which arose from the gram positive bacteria bacteria. You can then go on to say that the Bacteria are paraphyletic without the Neomura, but this phrasing used is rather awkward. I can't correct it without the article handy. I just can't seem to see what the second sentence is saying, so it's impossible to correct. I would simply like to see this clarified first, inserted into the article later. I don't have the article handy, but will try my best to read and understand as much as possible. [[User:KP Botany\|KP Botany]] 19:00, 2 June 2007 (UTC)

			:It's not correct to say the Archaea and Eukaryota arose from the Neomura; they each are part of Neomura. (It's like saying that Primata evolved from Mammalia.) If the hypothesis that Archaea and Eukaryota form a clade is correct then there are three alternative sub-hypotheses: either both evolved from stem Neomura (Cavalier-Smith's hypothesis, but there may be others), or Eukaryota evolved from Archaea (making Archaea paraphyletic), or Archaea evolved from Eukaryota (making Eukaryota paraphyletic). (The last doesn't seem very likely.) [[User:Lavateraguy\|Lavateraguy]] 21:22, 2 June 2007 (UTC)