|
Jhud -> RE: Documented evolution of new functions and behaviors in bacteria (4/18/2008 4:22:24 PM)
|
quote:
Yes, and so does the fact that the existence of certain feathered animals was predicted before they were found, while creationism and ID have yet to predict anything like this. So why is the first topic relevant, by your definition, but the second isn’t? I think I just explained why the predictions wouldn’t be comparable… quote:
Since you brought up your new argument about my trying to “score points” before I had a chance to explain what I meant by you “moving goalposts”, I’ll explain it now. As you probably remember, your original explanation of what you would find a convincing falsification of Behe’s claims was based on your comment that you would have considered the “flying penguins” adequate if those had actually existed. According to the definition you gave in this thread of what would constitute a “novel function”, flight in penguins would not be a novel function, since it’s an ability their ancestors had which penguins appear to have lost secondarily. Penguins probably still have all of the genetic code that’s necessary for flight; all that would be necessary for them to regain this ability is for the right regulatory mutations to reactivate the genes for it, and deactivate the genes for whatever traits they currently have that would make flight impossible. While it isn’t completely certain that for penguins to re-evolve flight would only depend on regulatory mutations, it’s at least as certain as it is the case of the examples I brought up in this thread. I’m sure you were aware of this when you saw that video, but you still used the penguins as an example of the type of thing you would find convincing. Clearly, when you gave me your original explanation of what you would consider a falsification of Behe’s claims, these sorts of changes which are most likely the results of regulatory mutations would have qualified. It was only when I actually provided an example of such a change that you altered your conditions for what you would consider a falsification of Behe—even though by your current standard for this, the flying penguins wouldn’t qualify either! Well, apart from the fact that the penguins were an Aprils fools joke, you are partially right; if it could be shown that multiple regulatory genes acting on extant genetic capabilities ‘re-enabled’ flight in penguins, then penguin flight wouldn’t meet my “separate yet interdependent mutations (which aren’t simply changes to genetic regulation)” criteria. In fact, that may be one of the difficulties of a concept like front loading; if the info is all there to begin with, and variable, then the limits of change are really only dependent on what already exists in the genome in terms of coding and regulatory genes. But this doesn’t help evolution, it hurts it, because it pushes genetic complexity even farther back in time, and makes it independent of selection factors. But the Douc Langur example doesn’t even rise to that; unlike flying penguins, which as you have noted would require multiple specific modifications to genes controlling their morphology and behavior, the Douc Langurs are an example of a single enhancement to an extant organ. Langurs in general already eat leaves, and they already can digest them – Douc Langurs just do it more efficiently. And as I pointed out, the example doesn’t require the gain of a function at all – it could represent the loss of a function, in that the Douc represent more closley the original ancestor of langurs than do the others. But none of this suggests I ‘moved the goal posts’; which is another term incidentally that tells me you are simply looking to score points rather than engage in a scientific discussion. quote:
I was hoping that after I answered your off-topic challenge about my motives, we would be able to return to the mutation topic. And yet here we are, with you continuing to make a big deal about the fact that I answered your question, without explaining why. I can’t describe how utterly bizarre this is. Here you are, continuing to complain about the fact that I’m answering your posts about a topic that you brought up, and that you seem to want to discuss more than any other topic! I’ve found the full text of the article about drug resistance in HIV; it’s at http://cat.inist.fr/?aModele=afficheN&cpsidt=3213943 . You have to pay to access the article, although you might be able to get it for free through an educational institution. I’ll be happy to discuss the details described there about how exactly these mutations affect the viruses that have them, but not before you at least attempt to address my point about you having a problem with me answering arguments that you bring up yourself. Hey, I was perfectly happy waiting for you to get the required information; I wasn’t questioning your ‘motives’ I was just curious why, if you aren’t so hip on genetics, you keep posting about them – that was all I asked – the rest was your little presumptive diatribe. And I’m not paying for the article; if there is a relevant portion, feel free to copy and paste the necessary portion.
|
|
|
|