It's basically correct to say that I do not challenge common ancestry per se but rather the concept that there was a single common ancestor cell or organism that gave rise to the three cellular domains of life. In a way my theory is more of a problem for creationists and their ilk than the old way of looking at things -- though those folks do not seem to sense this yet. Special creation starts with a given type of form that may or may not change but in any case remains "true" to its original character. "Intelligent design" seems to see different mechanisms being designed individually, just as an inventor or engineer would do. Well, in my theory none of this is the case. I have no trouble with a claim to the effect that God set the world up so that it progressed in an evolutionary fashion. That would affect my work no more than the belief that God's world was a mathematical world affected Newton's work; one can scientifically procede the same way with or without the assumption. And creationist or intelligent design views will be back where they belong, in the realm of (immature) religion.
Carl Woese dead at 84
I just heard word that evolutionary microbiologist Carl Woese has died. Woese is probably most famous for defining the Archaea, the "third domain of life".
Intelligent design proponents have touted Woese's ideas about horizontal gene transfer as a challenge to evolutionary theory, even claiming that Woese argued there were multiple, independent origins of organisms. This was wrong, of course.
Almost exactly a decade ago, I asked Woese to give his thoughts on his work and ID. I leave you with some of his comments:
89 Comments
Robert Byers · 2 January 2013
This comment has been moved to The Bathroom Wall.
https://me.yahoo.com/a/JxVN0eQFqtmgoY7wC1cZM44ET_iAanxHQmLgYgX_Zhn8#57cad · 3 January 2013
Woese is he.
Seriously, though, no one else ever made plants and animals seem so relatively close, while bacteria and archaea are now rather more distant. He will be remembered.
However, the name "archaea" does seem less than ideal, as if they were somehow old relics, rather than evolved modern organisms like, well, bacteria at least. Not nearly so important as the discovery itself, a relatively minor caveat.
Glen Davidson
Joe Felsenstein · 3 January 2013
(Please, let's have replies to Byers occur on the Wall, where his effusions and troll-chasing belong).
Carl Woese had a major effect on microbiology, beyond just defining the Archaea. In effect, he introduced the notion that microbes could evolve. Before his and his students' work in the late 1970s, most microbiology texts had discussions of classification but not of phylogenies. Microbial groups were defined on the basis of which chemicals could stain them or on some detail of their metabolism. But there were no trees in introductory microbiology texts. (If you find this hard to believe, go to a university library, get an old microbiology textbook of pre-1977 vintage, and try to find the phylogeny). While the work of the Woese lab never lacked for critics, after it microbiologists suddenly wanted to know what the phylogeny was. In my own university, shortly after Woese's work the faculty of the Department of Microbiology wanted to know how to reconstruct phylogenies, and they turned to one of their own graduate students who ended up giving them lectures on that.
Basically there were three great periods of advance in microbiology -- the classical era of Koch and Pasteur, the 1940s and 1950s when Luria, Delbrück, and the Lederbergs established that bacteria had genetics that could be studied, and the late 1970s when it was established that microbes did in fact have an evolutionary history. Very simply, Carl was the greatest microbiologist of our age.
How insightful Carl was became clear to me after he came to me with an argument about rooting the tree of life. He was convinced that if one compared sites in ribosomal RNA that were paired (in stems) with those that weren't (in loops) that one could separate evolutionary rate from time. He had a clever argument for this, but it was not algebraic. I thought the matter over, and sat down to write a long letter to him disagreeing, and showing why you could not do make the separation between rate and time. In the midst of my letter I suddenly realized that part of my algebraic argument was wrong, and when I corrected it, it became clear that Carl was absolutely right. Which is pretty darned good intuition.
Carl Woese was not particularly humble, and was always campaigning for one viewpoint or another, but most of those were not only right, they were important. Hail and farewell.
Douglas Theobald · 3 January 2013
ogremk5 · 3 January 2013
What was very interesting to me (when I started researching Carl's papers on domains and the archae kingdom was that I was taking HS biology just as these papers were coming out. So, I was taught about Monera.
When I started teaching HS Biology, I had to learn all that new fangled Domain stuff. I didn't like it.
Then I actually did the research and found out why the domains were needed and the value that they had and I learned to appreciate them.
harold · 3 January 2013
All
harold · 3 January 2013
All of cellular life, including archae, has remarkable biochemical overlap.
It seems as if Woese was proposing more than one abiogenesis events.
That's a very interesting idea; did he ever discuss the details of that?
FL · 3 January 2013
harold · 3 January 2013
ogremk5 · 3 January 2013
harold,
If you read his paper, Woese proposed and had shown (this was when molecular biology was just coming into the fore) that Archae were as different from Eubacteria as Eubacteria was from Eukaryotes.
My understanding is that Archae are the proposed 'first group' because Archae have some characters that are more like Eukaryotes than Eubacteria and some characters that are more like Eubacteria than Eukaryotes.
So, not multiple abiogenesis events.
Paul Burnett · 3 January 2013
ogremk5 · 3 January 2013
Here's a write up I did... including a link to the original article: http://ogremk5.wordpress.com/2011/02/16/the-three-domain-system/
Joe Felsenstein · 3 January 2013
FL · 3 January 2013
"Authoritarian"? I thought H. Allen Orr was an evolutionist.
Starbuck · 3 January 2013
hrmm but lipids from which membranes are constructed differ widely between bacteria and archaebacteria, those lipids probably arose independently. Eukaryotes and eubacteria have the same kind of lipids.
Douglas Theobald · 3 January 2013
So I was wrong --- Woese (with Fox) actually did first come up with the name archaebacteria; for some reason I thought it had been in use earlier. Its from the famous 1977 paper. See Joe's comment for why Woese thought the Archaea were "ancient".
Woese CR, Fox GE.
"Phylogenetic structure of the prokaryotic domain: the primary kingdoms."
Proc Natl Acad Sci U S A. 1977 74(11):5088-5090.
http://www.pnas.org/content/74/11/5088.full.pdf
Frank J · 3 January 2013
You might recall how, ~10 years ago, in the same paragraph, the Isaac Newton of Word Games notes how his buddy Michael Behe accepts common descent, while Woese - not an ID/Creationist - "explicitly denies" it. All the while having the chutzpah to keep you guessing on his position.
apokryltaros · 3 January 2013
Rolf · 4 January 2013
Would not common sense suggest that if there were one abiogenesis event, there might as well have been another - more or less remotely 'related'?
How can we know for certain one way or another? All we possibly might learn is whether all known life is descended from the same event or not - but can we rule out events that left no trace?
FL · 4 January 2013
fusilier · 4 January 2013
eric · 4 January 2013
apokryltaros · 4 January 2013
ogremk5 · 4 January 2013
apokryltaros · 4 January 2013
harold · 4 January 2013
harold · 4 January 2013
Carl Drews · 4 January 2013
ogremk5 · 4 January 2013
John · 4 January 2013
I am certain James A. Shapiro will lament especially Woese's passing over at his HuffPo blog if he hasn't already, since he has described Woese as the greatest living evolutionary biologist of our time. While I do acknowledge Woese's important contributions to microbiology and systematics, and express my condolences to his family, his friends and his colleagues, I would not regard him as a scientist as important as Dobzhansky, Fisher, Mayr, MacArthur, Maynard Smith, Simpson, or Wilson.
Helena Constantine · 4 January 2013
Just Bob · 4 January 2013
Joe Felsenstein · 5 January 2013
I recall that Woese, about a decade ago, argued that the most recent common ancestor off all life (and that is a life form much later than the origin of life) was most likely not a single species, but that life forms of that period probably swapped genetic material around quickly. So that there was not one LUCA (last universal common ancestor) but rather a bunch of them.
Do I recall Woese's argument correctly? It is one that would be hard to test even with complete genomes of many widely-diverged species.
Frank J · 5 January 2013
stevaroni · 5 January 2013
Realistically, there were probably thousand - or millions - of "Genesis events" where a self-replicating molecule got formed.
In almost all cases these events would have been dead-ends. A warm little pond that dried up in the sun. A bubble in an ice cube that melted. A fissure in clay that dissolved in the next high tide. A really inconvenient meteorite.
Given the relative paucity of organic molecules on the early Earth it was almost inevitable that any abiogenesis event would be nipped in the (proto)bud.
It would have been the incredibly lucky molecule that managed to hang around long enough, in a rich enough, protected enough, environment to establish a stable lineage.
I can't see how it's anything but likely that there had to be more than one event, since most of them are destined to fail.
Of course, once some simple pre-biological lineage did establish itself, it got an almost insurmountable first-mover advantage. From now on, little bits of free-floating amino acid were no longer genesis molecules in potentia for some competing design, instead they got a new name - food.
Right now there are probably two organic molecules in you garbage disposal that just linked up into something that might just could possibly self-replicate given the right chance and 10 million years to work on it. Oops... it was just eaten by a fungi.
Ron Okimoto · 5 January 2013
harold · 5 January 2013
Helena Constantine · 5 January 2013
Frank J · 6 January 2013
harold · 6 January 2013
Frank J -
Probably the single most beneficial development I have seen in terms of defending science and science education is people challenging ID/creationists for their own explanation.
All they want to do is attack straw men and change the subject.
This is partly due to the outcomes of trials. Since Edwards v Aguillard it has been politically useless for them to openly declare a purely religious explanation. At Dover Judge Jones repeatedly brought up that ID was just evolution denial.
It's partly due to the Internet, too.
The most terrifying thing an ID/creationist can hear is "I'm willing to listen to your explanation; what happened when, and what is your evidence for that?".
Frank J · 6 January 2013
Scott F · 6 January 2013
I'm no biologist, but doesn't the fact that Archaea, Eucaryota, and Bacteria all use DNA as the genetic transcription medium suggest that any "first replicator" happened way before that split? My limited understanding was that DNA itself is relatively highly "evolved". Past the "first replicator", I'm fascinated by the notion that "evolvability" first had to "evolve" from the "first replicator".
Rolf · 7 January 2013
Henry J · 7 January 2013
And that leads to the question of why they think God would be unable to get natural processes to produce results that meet her requirements. Their whole argument appears to assume this, even though it also appears to me that it contradicts the basic assumption behind the God concept.
Carl Drews · 7 January 2013
Suppose NASA gets a bunch of money, sends an ice-penetrating probe to Europa, and the probe finds self-replicators in the liquid water beneath the ice. Suppose the probe is equipped with a sophisticated chem-bio lab. How would you distinguish:
A) A common abiogenesis event with Earth.
B) A separate abiogenesis event on Europa.
If B), should the little replicators on Europa have DNA but with wildly different sequences?
Henry J · 7 January 2013
I guess that would depend on how much influence the chemical properties have on the correlations between DNA/RNA sites and amino acids.
Bobsie · 7 January 2013
eric · 7 January 2013
DS · 7 January 2013
In my opinion, Eric is correct. We might expect to see some similarities, especially if the two environments were similar. This might simply be due to constraints on the evolution of replicating systems, even if there were actually two separate origins. Indeed, this would teach us a lot about what real constraints exist and what might just be due to chance events and historical contingency. I wouldn't even expect life elsewhere to be organic, but it might be. If it were organic, it might or might not use DNA as the genetic material, but even if it did it might still be an independent origin. Likewise it might or might not use the same bases to code for information.
What you would absolutely not expect to see would be two convergent genetic codes, since most of the features of the code are considered to be arbitrary. You would also expect fundamental differences in ribosome structure and the details of the cellular machinery and genome structure. And of course, it should not be possible to place an independent origin within a phylogentic context in the terrestrial tree of life. At the very most you might get a completely unconnected branch.
Since this is not an implausible scenario, some science fiction has been written about it. The most important thing is that we will learn a lot if an independent form of life is ever discovered. Until then, in a very real sense, we only have one example from which to generalize.
harold · 7 January 2013
Carl Drews · 7 January 2013
Thanks for the answers. I did not know what was contingent and what was required. I am currently reading James Watson's The Double Helix (2012), and of course in the book it has to be a double helix with CTGA!
We might get a chance to practice for Europa within a year or two. The British team has called off drilling into Antarctica's Lake Ellsworth because of technical difficulties:
http://www.bbc.co.uk/news/science-environment-20850360
But they will be back! Or another team will penetrate Lake Vostok.
For the reasons Eric mentioned in his first paragraph, I would be gob-smackingly surprised if they found evidence of a separate origin for any biological replicators they pull up out of the lake. (I don't know what else to call them - bugs?) The sub-Antarctic lakes have been frozen over for only millions of years, and they are not isolated now. One could place a brass dollar coin on the surface of the ice cap and in a few hundred thousand years it would progress downward with the ice layers and melt out into the lake. Bugs can do the same thing.
But it will be fascinating to see what's down there! And Lake Ellsworth is a lot closer than Europa.
TomS · 7 January 2013
eric · 7 January 2013
DS · 7 January 2013
Actually, I think Pauling proposed a triple stranded DNA molecule. Who knows, maybe somewhere that's s the way it is.
Douglas Theobald · 7 January 2013
Joe Felsenstein · 7 January 2013
Thanks, Doug. I am now fully informed.
Henry J · 7 January 2013
Sounds like he was saying that individuality is an advanced trait that wasn't present in the early stages.
Frank J · 7 January 2013
harold · 7 January 2013
Tenncrain · 7 January 2013
I have enjoyed reading the recent chat here by harold, DS, Carl Drews, etc regarding RNA/DNA and to hypothesise about abiogenesis. While it's too bad our resident trolls are too inflicted by Morton's Demon (named after ex-YEC Glenn Morton), it's nice that I and a few others here at PT can learn a thing or two about science. James Watson’s The Double Helix is now on my list of books to read, when I find some time that is.
Steve P. · 7 January 2013
What is interesting Douglas, is that Woese, like lots of proponents of Darwinian evolution, trot out the YEC 'individual crafting of parts like a machinist' position as also being an ID position, which is patently untrue. In fact, ID has no such debt to YEC.
Even Darwinian evolution skeptic Michael Behe made an off-hand comment that a single progenitor cell was a plausibility, an idea compatible with Woese' take on early life. So this seems just another strawman characterization of the ID position.
What is more curious though, in the context of this OP is that no matter what scenarios are proposed by people like Woese, these ideas can all live under the humongous Darwinian evolutionary tent.
No scenario left behind.
Just Bob · 7 January 2013
Hey Stevie, what would we gain by switching over to ID-inspired science?
DS · 7 January 2013
TomS · 8 January 2013
gmartincv · 8 January 2013
stevaroni · 8 January 2013
eric · 8 January 2013
harold · 8 January 2013
Steve P. · 8 January 2013
Steve P. · 9 January 2013
Steve P. · 9 January 2013
Dave Luckett · 9 January 2013
Harold is not implying that Woese was wrong. He did not lambast anyone, not even Behe. His questions have not been answered in even vaguely responsive terms by you, or as far as I know, anyone who asserts "non-Darwinian" origins for the species. Sneers, falsehoods, irrelevancies and snide remarks are no substitute for evidence.
Dave Luckett · 9 January 2013
No, the hypothesis of "design" does not absolutely require the identification of a designer, although it would be a little less vacuous if one were identified. It does, however, require evidence that design occurred. Produce it, please.
The physics and chemistry that produce variation in allele are actually fairly well understood, even though they are formidably complex. From a genetic perspective, their effects have been understood for a century or more now, and the basic biochemistry for about half as long. The mechanism that selects the successful variations among those produced by this process is also well understood.
Those are the mechanics of evolution. They can be and have been minutely specified and subjected to endless experiment. Please specify the mechanics of intelligent design to the same degree of detail.
Steve P. · 9 January 2013
Douglas, of course HGT is a challenge to Darwinian evolutionary theory.
..co-opting this concept is simply an attempt to punt the ball....as I alluded to several times in a discussion with Flint in a past posts, how does one account for the ability of early life to possess any 'abilities' - but specifically in this context, the ability to recognize new genes and utilize them, the ability to copy and release them to other organisms?
...all these myriad mechanisms which existing at the start of life are never adequately explained by ND, just a simplistic explanation and then 'OK, folks lets move on'.
apokryltaros · 9 January 2013
apokryltaros · 9 January 2013
Godthe Designer did it is simply a variation that science is not necessary because it's too hard and too yucky for him to ever bother understanding.Dave Luckett · 9 January 2013
In archeology, one usually can't identify the designer of an artefact at all. A general cultural context is usually the best that can be done. However, the general techniques, methods and material used can be specified. In animal behaviour, no designer is ever specified, either of the animal, or of the behaviour. In criminal forensics, the purpose is not necessarily to associate any particular person with the crime, but often simply to define more closely what happened, when, by what precise means, and under what precise circumstances. Hence a hypothesis of design does not necessarily include the identity of the designer, but it does, and must, say what happened, generally when, and by what means or techniques, using what materials. If it does not specify these at least, it is merely vacuous.
If Steve P or any proponent of intelligent design were to say what happened in any terms other than the vaguest of handwaving, the hypothesis could be tested. But they refuse to do that - for that very reason. Absent such a description, it can't be tested - which is exactly what they want.
But if it can't be tested, it isn't science.
harold · 9 January 2013
Just Bob · 9 January 2013
j. biggs · 9 January 2013
eric · 9 January 2013
PA Poland · 9 January 2013
Rando · 9 January 2013
So Stevey says he's answered the "Harold List," okay Stevey since I've been running around the internet with it too, I have made my own additions to the list. Why don't you try answering my additions to the list.
1) The DI is always arguing that they are capable of “detecting design.” Explain the methodology of “detecting design?”
2) The DI is always using “Complex Specified Information” to say that design can be demonstrated. Okay, what is “Complex Specified Information?” Can it be quantified? How is “information” measured? How much “information” does it take to make a man? A fish?
3) Maybe you want to discuss the odds of evolution. Okay, what are the odds? Can you explain how they came up with that number? Can you show the exact calculations they used to produce this number? If that’s too hard, can you at least tell us where to start to calculate the odds?
In addition to answering my questions I want you to either answer the "Harold List" again or post a link to the answers so that I can see them.
Mike Elzinga · 9 January 2013
bigdakine · 9 January 2013
Rolf · 9 January 2013
harold · 9 January 2013
Steve P. · 9 January 2013
Douglas Theobald · 9 January 2013
Too much off topic, off OP, so shutting down.