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The fundies keep coming at me - here's another one of the crowd of angry bees that descends every time I mention evolution: "You don't even address the concept of irreducible complexity. Darwin himself said that if it could be demonstrated that an organism could not have formed through small, successive changes that his theory would break down. Irreducible complexity attempts to show that certain biological machines could not have formed by small, successive changes. The bacterial flagellum is the classic example given by Behe. It would seem that you could silence the argument by giving a detailed, biological explanation for how this biological machine could have evolved through small, successive changes over long periods of time. Is there such an explanation?"
Not sure the 'bacterial flagellum' is the first classic example, thought that was originally the human eye - too easy to show all the steps in that one I guess (so easy that Darwin himself did it for interest), but it has since become one. In fact I guess you would choose examples like bacteria because of the virtual absence of the fossil record for such species - groups with good fossil records (because they have hard parts which preserve well), like vertebrates and shellfish show all too clearly the evolutionary steps for the most complex systems.
But before I have a go at the 'bacterial flagellum' (and this is not my field of expertise), let me reverse the question to all the creationists out there. Just imagine that one of your creationist gurus (I was searching for a word there, these people are not scientists, and even 'gurus' flatters them, but I don't like being rude even about such creatures of the primeval slime, oops, sorry) has finally, in triumph, managed to come up with a structure of some kind whose evolutionary origin for the time being baffles the experts on the species concerned. What do you think that would mean?
Do you imagine that god, after the long lunch that he took after sending a lightning bolt through the primeval ooze thus getting evolution started, would get back to the office and say, 'oh...my...self, I forgot about bacterial flagellae, no way they are going to get evolved through natural selection, I'd better just whip (yes, a pun) one up, then I can go and have a long dinner because everything else can get taken care of by natural selection'? Or does he pop in every so often and have a bit of a fiddle to keep his hand in so to speak? Or do you imagine that if you found one example this would mean that everything else got done by god too? But why would you think that, when natural selection was working perfectly well? I ask in all seriousness, because I have a lot of trouble understanding the minds that can believe this stuff.
Now back to flagellae. Several things the creationists forget to tell you fundies about evolution. First natural selection works on function not structure. Second a structure that is doing a particular job in one organism may not have come into being through stages in which it was doing the same job - this is perhaps the fundamental (yes, another pun) flaw in irreducible complexity. That is each stage may fill a particular function, and therefore be selected for, and then be subject to quite a different selection pressure later on to take it in a different direction. And finally, genes and structures and functions rarely have one to one correspondence - a change in one gene that is responsible for a particular protein may have effects throughout the muscular and skeletal and nervous and circulatory systems for example, and therefore produce an effect out of all proportion to the minor mutation. Conversely it is possible to occasionally get major mutations that are not lethal and cause a decided shift in function.
With all that in mind, take a look at: www.talkdesign.org/faqs/flagellum.html. This is one possible solution (part of an ongoing debate - that is how science works) and introduces a whole lot of literature on the subject. It illustrates the proposition that the stages along the way can each be functional (for different functions) and unrelated to the final structure (and function). And that this, the classic case of intelligent designers, fails the test of irreducible complexity because the flagellum demonstrably contains at least one sub unit (actually more, but just one is enough to destroy the argument) which has a different function.
But there is something broader that is puzzling me about all this. Even in the bad old days of 20 years ago it was quite possible to go into a library, look up Biological Abstracts, and start finding literature relevant to the flagellum. Now, and I know this will come as a shock to many people, it is possible to use, on something called the 'internet', something called Google. A search on 'Bacteria - flagellum - evolution' brings up, in half a second, 190,000 references. The one I pulled out above is just one of the more recent ones, and a very detailed scientific look at the evolutionary pathways which were probably involved. On that very first search page we also find - http://www.millerandlevine.com/km/evol/design2/article.html, a detailed 2004 scientific debunking of irreducible complexity, both in general and specifically related to the flagellum, and of intelligent design which rests on the idea of irreducible complexity. No one reading even this article (and Dr Miller is a religious man it seems, as well as an evolutionist) would have a moment's doubt that Behe and Dombski have been deliberately misleading and that there is no such thing as 'irreducible complexity' in nature.
Given that, why would a poster raise the 'flagellum question' yet again and pretend that it was an unsolved mystery? Now I am just a simple country boy, but I suspect there may be one or two cynical peple who might think that a fundy behaving in such a way might be deliberately attempting to mislead his fellow fundies. He might for example (and I shudder to be so cynical on the behalf of others) have his own blog where he would refer to my article and pretend that irreducible complexity was alive and well and rebutted what I was saying. Such a blog, aimed at uneducated and trusting fundies would be quite immoral of course, so I wouldn't suggest that anyone would behave like that. Still, the inability to do a Google search and instantly find an answer to a question you are pretending doesn't have an answer sure makes even a simple country boy put one flagellum with another flagellum to make three flagellae. It is possible to reduce irreducible ignorance, but the leaders of the ignorant have to want that to happen.
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