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Ready, Steady, Evolve

Stront writes "New Scientist is reporting that plants and animals can 'bottle up' evolution until they need it. A certain protein 'hides away' mutated genes acting like a genetic valet, however in extreme environments, such as high temperature or noxious chemicals, the cleaning process breaks down and the mutations are released all at once. This goes some way to explaining examples that are considered to defy standard evolutionary theory, such as the Bombardier Beetle."

19 of 794 comments (clear)

  1. It's a theory... by Mwongozi · · Score: 4, Insightful

    You can't "defy" a theory. That's why it's called a theory. Theorys "evolve" (heh) until they finally fit all the available facts, and then we can be fairly sure that that is what is really happening.

    1. Re:It's a theory... by KILNA · · Score: 4, Insightful

      I love the folks who like to tell you that "evolution is just a theory". The statement is rather loaded. It is a theory, yes. But so is the theory of gravity, and the round-earth theory. Just because a concept happens to be a theory doesn't preclude it from also being an observable fact. So far, evolutionary principles are a visisble, reproducible phenomenon, and has been observed in the laboratory and in the field. Most importantly, you could disprove evolution right now if you could show verifiable supernatural causality for what we observe in speciation. Creation "science" has no outlet to invalidate it, offers no verifiable causality for speciation, and presumes the existence of a supernatural event to explain the natural world. That's not even a theory, its a fairy tale.

      --
      Error: PANTS NOT FOUND. Press <F1> to continue.
  2. Bombardier Beetle by spakka · · Score: 4, Insightful
    ...examples that are considered to defy standard evolutionary theory, such as the Bombardier Beetle.

    Only if you're a creationist.

    debunking
    1. Re:Bombardier Beetle by Latent+IT · · Score: 5, Insightful

      Well, since you don't want to (can't?) read the article linked to above before criticizing, I'll quote it for you.

      Quinones are produced by epidermal cells for tanning the cuticle. This exists commonly in arthropods. [Dettner, 1987]

      Some of the quinones don't get used up, but sit on the epidermis, making the arthropod distasteful. (Quinones are used as defensive secretions in a variety of modern arthropods, from beetles to millipedes. [Eisner, 1970])

      Small invaginations develop in the epidermis between sclerites (plates of cuticle). By wiggling, the insect can squeeze more quinones onto its surface when they're needed.

      The invaginations deepen. Muscles are moved around slightly, allowing them to help expel the quinones from some of them. (Many ants have glands similar to this near the end of their abdomen. [Holldobler & Wilson, 1990, pp. 233-237])

      Some invaginations (now reservoirs) become so deep that the others are inconsequential by comparison. Those gradually revert to the original epidermis.

      In various insects, different defensive chemicals besides quinones appear. (See Eisner, 1970, for a review.) This helps those insects defend against predators which have evolved resistance to quinones. One of the new defensive chemicals is hydroquinone.

      Cells that secrete the hydroquinones develop in multiple layers over part of the reservoir, allowing more hydroquinones to be produced. Channels between cells allow hydroquinones from all layers to reach the reservoir.

      The channels become a duct, specialized for transporting the chemicals. The secretory cells withdraw from the reservoir surface, ultimately becoming a separate organ.
      This stage -- secretory glands connected by ducts to reservoirs -- exists in many beetles. The particular configuration of glands and reservoirs that bombardier beetles have is common to the other beetles in their suborder. [Forsyth, 1970]

      Muscles adapt which close off the reservoir, thus preventing the chemicals from leaking out when they're not needed.

      Hydrogen peroxide, which is a common by-product of cellular metabolism, becomes mixed with the hydroquinones. The two react slowly, so a mixture of quinones and hydroquinones gets used for defense.

      Cells secreting a small amount of catalases and peroxidases appear along the output passage of the reservoir, outside the valve which closes it off from the outside. These ensure that more quinones appear in the defensive secretions. Catalases exist in almost all cells, and peroxidases are also common in plants, animals, and bacteria, so those chemicals needn't be developed from scratch but merely concentrated in one location.

      More catalases and peroxidases are produced, so the discharge is warmer and is expelled faster by the oxygen generated by the reaction.

      The walls of that part of the output passage become firmer, allowing them to better withstand the heat and pressure generated by the reaction.

      Still more catalases and peroxidases are produced, and the walls toughen and shape into a reaction chamber. Gradually they become the mechanism of today's bombardier beetles.

      The tip of the beetle's abdomen becomes somewhat elongated and more flexible, allowing the beetle to aim its discharge in various directions.


      Why, that sounds like a series of random... oh, forget it. You'll probably ignore this too.

    2. Re:Bombardier Beetle by ShavenYak · · Score: 4, Insightful

      I am not saying that I don't believe in large evolutionary changes - just that they require different, more difficult evidence than small changes.

      Well, it's like this. We know small changes occur. If enough small changes occur in a row, common sense indicates that the result is a large change. Apparently that common sense is lacking in some creationists, who seem to believe there is some "kind barrier" across which mutations cannot progress, despite the fact that there is no evidence of such a barrier. Believing things without hard evidence, though, is right up their alley.

      Human beings and chimpanzees share like 99.6% of their DNA. A little bit of extrapolation based on known rates of genetic change indicates that a common ancestor is very plausible. Extend this same concept across all the known genera and species, and evolution hardly requires any huge leap of faith. It certainly doesn't require belief in any mechanism for which we have no evidence.

      Keep these things in mind the next time a creationist tells you "It takes more blind faith to believe evolution than creation."

      --

      Hey kids, there's only 5 days left 'til Yak Shaving Day!
  3. Re:Evolution by e8johan · · Score: 3, Insightful

    The basic process of producing enzymes from the DNA/RNA is just a simple chemical process, i.e. the laws of the nature (which are due to quantum effects if you want to go all the way, as far as we know it today anyway).
    As for genetic programming, you are right, someone has to provide a set of common rules, building blocks, whatever, but a random process actually reaches a solution through selection of the fitest, which I find nice...

  4. Re:Hmm... by sgage · · Score: 5, Insightful

    Natural selection doesn't work on genes, it works on phenotypes - the expression of those genes. If a bunch of mutations are "hidden" for a time, but then suddenly expressed in a time of "need" (i.e., rapidly changing environment), selection can then do its thing.

    This finding in no way goes against natural selection.

  5. Re:Hmm... by sgage · · Score: 4, Insightful

    " If evolution is trial and error, then how would evolution know what to queue up? It could be a queued up sequence of disastrous changes."

    Evolution most definitely does NOT know what to queue up. And yes, it might queue up disastrous changes. A lot of natural selection takes place very early in embryonic development, and the real disastrous changes are eliminated right then and there (reabsorption, miscarriages, spontaneous abortions).

    That said, as an ardent evolutionist with an MS in population genetics, I sometimes have to wonder about things like the bombardier beetle. The genome has its own "grammar", and the simple model, while a decent big picture, doesn't (yet) cover the incredible complexity and subtlety of what's going on.

  6. Re:"thinking" by Anonymous Coward · · Score: 5, Insightful

    I particularly liked "Everything in evolution is supposed to make perfect sense and have a logical purpose" Says who? The whole freaking point of evolution is that it is a choatic process with an ordered outcome. I expect there were lots of little beetles blowing themselves up at some point. Guess what? Those beetles didn't produce any offspring, and thats why you don't see any. The ones that didn't blow themselves up produced offspring. Oh look, more beetles.

    The fear of evolution is partly based on the idea that man is perfect, and then from that the fear that a perfect being could have evolved from chaos.

    The flaw is believing that man is perfect.

  7. Missing the Point? by BoBaBrain · · Score: 3, Insightful

    "This goes some way to explaining examples that are considered to defy standard evolutionary theory, such as the Bombardier Beetle."

    OK, I'll bite. Time to feed the Trolls...
    The bombardier beetle never defied standard evolutionary theory. It may have defied belief, but that's a different matter entirely. If anything, the bombardier beetle, and countless other amazing species, show the awesome power of something as simple as random mutation and selection.

    --
    I am a Karma Library.
  8. Intelligent design? by k98sven · · Score: 4, Insightful

    Yeah. Creationists are always quick to point out
    what they percive as "intelligent design".

    On the other hand, they completely ignore that nature is far more abundant with "unintelligent design" - especially at the molecular level.

    Intelligent design would be to use the same enzyme in all animals. Today, you have the same enzymes, but they have differences, not in function, but in all kinds of non-important ways.

    Strangely (for the creationist), these differences are larger between, say a human and a bacteria than between two different types of bacteria.

    Oh, and that beetle example is bulls**t. Read some non-biased information somewhere
    instead of that pseudoscientific creationist crap.
    (someone linked to a faq at talk.origins, probably a good place to start.)

  9. Re:Question for creationists by capt.Hij · · Score: 3, Insightful
    Also, the Genesis flood would have greatly upset the carbon balance. The flood buried a huge amount of carbon, which became coal, oil, etc., lowering the total 12C in the biosphere (including the atmosphere--plants regrowing after the flood absorb CO2, which is not replaced by the decay of the buried vegetation).

    This is the problem with trying to argue these points when science and religion collide. Both sides believe that they are correct based on their own dogma. The religious side is correct because the bible is correct - end of argument. The science side is correct because this is the prevailing paradigm.

    There is one interesting piece in the article:
    We should remember God's admonition to Job, 'Where were you when I laid the foundations of the earth?' (Job 38:4).

    It is interesting to note that this argument cuts against both sides!

  10. Re:Why can't we think for ourselves? by Hrothgar+The+Great · · Score: 4, Insightful

    Most of us have thought for ourselves; hopefully by reading some material from both sides of this argument and deciding based on the evidence presented whether they too believe in the theory of evolution or not.

    The thing that draws most scientifically minded people to evolution is the scientific observations presented to back it up, and the difficulty in refuting it for the most part. Christianity on the other hand, while having the difficult to refute part down REALLY solidly, has only a series of assumptions based on "faith" for its defense. No offense to anyone's religion, but religion not only is not equal to science, but it doesn't even WANT to be like science. You're not SUPPOSED to test your God. You're just supposed to believe. Nothing wrong with that, but when you start putting up faith in the face of scientific data, it's a bit silly.

    Your philosophical argument about thought is very interesting, but I don't need faith in my own intelligence either. I believe what I see with my own eyes; i.e. thinking for myself.

  11. Re:Why can't we think for ourselves? by Bobo_The_Boinger · · Score: 5, Insightful

    Let me preface this by saying that I do believe in God (after thinking everything through and deciding for myself)

    Just because evolution was taught as truth in high school and college, and it allows you to live your life any way that you want without concern for life after death or accountability to a higher power doesn't mean that you should buy it.

    It upsets me that so many people who believe in God imply that simply because someone does not believe in God they cannot have any true morals or ethics. I did not believe in God through most of high school and college, yet (I believe) I was a very moral person. I did not drink, did not do drugs, worked hard, tried not to lie (though I was somewhat less successful in that regard :) ). This was all because I felt a bond to my common man, not because I feared reprisal in the afterlife. How were my morals any less real than the morals of those who 'do right' because their God tells them to? Belief in God in no way equates or even implies morality or ethics. Look at the Sept. 11th hijackers. They most likely believed very strongly in God. You could argue that they didn't follow God's teachings, but the point is that they believed they were.

    I realize that this is going to get modded down, but it frustrates me that so many people who pull this "I'm an intellectual therefore I believe in evolution not God" crap are actually simple drones of the left. Think for yourself, will ya?

    (Note, I have moderator access, but I think responding is much better to this than modding down)
    I am sure there are just as many drones on the right who simply believe in God because it is easier. Most Christians (the majority of religious people in America) have not read the Torah, Koran or Bhagavad Gita. Why is this? Is it because they know after reading the Bible that nothing else can possibly be correct? They may say that to themselves, but I doubt it is the truth. I find it much more likely that the Bible is what they were brought up with, and it is simply easier to follow what they already know as opposed to working to figure out what they can truly put their faith in.

    I find it perplexing that many people take the time to diligently study the religion they were brought up to know, yet few take even scant moments to study the countless other religions in this world. Well, no, it doesn't really perplex me. It saddens me.

    --
    --David
  12. Re:Bombadier Beetle faq link by ShavenYak · · Score: 4, Insightful

    The bombadier beetle's boiling water mechanism is irreducibly complex. Any of the parts of the system that would have evolved would have been useless and arguably detrimental without the other parts of the system.

    Sounds like you didn't read the refutation. Many of the parts of that system do exist in other beetles. "Irreducible complexity" is a myth creationists invented because the big words made their ranting sound scientific.

    --

    Hey kids, there's only 5 days left 'til Yak Shaving Day!
  13. Re:It's called Punctuated Equilibirum... by cryptochrome · · Score: 3, Insightful

    Actually this new theory/evidence just provides a little extra bang to punctuated equilibrium. It could already be explained based purely on natural selection. In that case, the triggering factor is also stress - a form which had been favorable and therefore selected for in an environment is no longer so favorable when the organism's environment changes in some way, at which point natural selection starts weeding out that species, unless a series of mutations occurs that gives it an edge. Of course, such a major change in a species will itself have a marked effect on the environment, thus triggering changes in other species, and so forth. An evolutionary domino effect. The more dramatic the change, the more dramatic the effect. One of the most pronounced examples of this was after the dinosaurs were killed off, when mammals rapidly evolved in response to so many empty ecological niches.

    --

    ---If you can't trust a nerd, who can you trust?

  14. Re:parahydroxybenzene by Bobartig · · Score: 3, Insightful

    Well put. Creationist Science, much like Christian Science*, is NOT a science. So much of the "Creationist Science" rhetoric seems more like academic attrition than any science at all. They look for increasingly hard to explain phenomena, with no regard for the larger, more patternistic (or evolutionarily "behaved") systems out there, then refute the entire theory of evolution by pointing wildly at their red herrings.

    Their inappropriate use of the word "science" maligns the reputation of legitimate science for academics and researchers everywhere.

    P.S. you didn't miss much in the article, its repetitious, involves lots of exploding beetles, and eventually resorts to name calling (an ad hominum attack as a result of ad hominum attacks),

    * I have nothing against Christian Scientists. It is a legitimate religion. Additionally, all the Christian Scientists I know agree with the sentiment that their faith is indeed not a science.

    --
    This is where I get my recommended daily allowance of "Foot in Mouth."
  15. if ($religion==$ethics) {} by phorm · · Score: 4, Insightful

    Religion is only part of the equation for a "good person." In many religions, zealotism breeds people who are immutable to outside suggest, and often hostile towards those who do not share their beliefs. In other cases, indeed in many cases, they simply view themselves are "better people".
    This is not to say that relgion does no enhance life. I see many religious people who do good things for the world/community based on their beliefs.
    I've also seen many non-religious people who also do a lot of good, not out of any believe in heaven or an afterlife, but simply because they believe in doing good. The contrast to this is ina a few people I know, we can take a few friends of mine.

    Friend 1: Found little point in life, was quite constantly depressed. Verged on very drastic negetive consequence. She became "Christian" (though many other religions are good as well, I won't say Christian is the best) and was embraced by her church, found love and certain amount of peace in herself. She seems a lot happier lately

    Friend 2: Was raised as an athiest, by athiests. She has not only no religion, but also background reason for life, or a strong basis for doing anything. She seems wholly unsatisfied at most times, and care little for many of her actions. This isn't to say that she's done strong harm to anyone else, but she lacks a fundamental goal in life, doesn't believe in having children (world sucks too much to raise them in), and often enough has a "what's the point attitude."

    Friend 3: Has no real religion. Was raised by a supportive and loving family. Believes she has a future, and wants to propogate children. She often helps others, and is a caring, giving individual.

    I've met a lot of other people who are quote religios" but do wholly bad things. They tend to have a good regard for their church circle but little for those outside.

    My point. Relgion doesn't always define a meaning in life, but it often helps. The fundamental teachings and upbringing behind it are what is essential. If a church is teaching you how to be a good person, and not teaching you intolerance of others, then the church is doing a good job. If your parents raise you with the same values, then your parents are doing a similarly good job.
    Often, it's the basic teachings (play nice, be a good boy Vs care for others, be a good Christian/other) that are important.

    I have no name for my believes. I disagree with a large part taught by my family's religion, but agree with many of the basic tenets of goodness towards others. I also believe in evolution, but also in a higher power, and yet don't find a conflict. I'm definately not a bible banger, but I'm happy in my own purpose in life, which is what I think really counts.

    Contradictions and agreements are welcome, but remember to think before you post - phorm

  16. Re:proof vs. faith in religion by Dan+Crash · · Score: 3, Insightful

    God and the very concept of absolute, objective truth are inseparable. If objective truth exists, it can only exist because it is embodied in the nature of God.

    Science doesn't claim "objective truth", at least not in the philosophical sense you mean it. Scientific truths are never claimed to be anything more than theory informed by repeatability. I'm comfortable basing my worldview on that. In fact, I'm not only comfortable, I feel that it's the only secure ground to stand on.

    I can't follow the rest of your argument because it's a non sequiter. You go from objective physical truth (which science doesn't claim, but does investigate) to objective moral and ethical truth (which science doesn't claim or investigate).

    --
    He who refuses to do arithmetic is doomed to talk nonsense.