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Author Topic:   How can evolution explain body symmetry?
Chiroptera
Inactive Member


Message 5 of 284 (111571)
05-30-2004 1:28 PM
Reply to: Message 1 by CrackerJack
05-29-2004 11:59 PM


You seem to think that the two sides of a body develop independently from one another, and this is not so. Much of the development of the embryo occurs because differences in the relative concentration of various developmental proteins causes different cells to develop into different tissues. For example, if a certain hormone was produce along the axis of the embryo, then the concentration would decrease at the same rate in any direction from the axis, and so similar developmental patterns would appear in these directions. Of course, there are many such developmental proteins, some inhibitory hormones, and various centers arise for other horomones throughout the body, so the actual pattern that arises is the complexity that we see in the adult organism. But the point is that it isn't hard to see how changes in the developmental hormones, or in the response of cells to these homones, would cause two ears or two eyes or five starfish arms to all evolve at the same time.

This message is a reply to:
 Message 1 by CrackerJack, posted 05-29-2004 11:59 PM CrackerJack has replied

Replies to this message:
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Chiroptera
Inactive Member


Message 176 of 284 (221443)
07-03-2005 11:13 AM
Reply to: Message 174 by MrSmee
07-03-2005 10:42 AM


Very off-topic, but I'll reply anyway.
Hello, MrSmee. Cool name, a Peter Pan fan?
Most of your post is off-topic, but a discussion of these things would be useful. Perhaps you can find some ongoing threads where some of these points would be more relevant? You could start a new thread, too, but there's too much, I think, in your post for a single topic -- people here prefer that threads more or less focus on a single subject, or at least a very narrow range of topics.
Anyway, there is one quote that does stand out:
quote:
All cars are manufactured with the same materials but were all designed by the same group of designers...humans, so they have uniquely similar traits to one another, if God created all living things then yes everthing would have been created with quite similar biological and chemical compositions but ultimately each and every car being different but yet still an automobile.
Since the heirarchical classification of life is something I find fascinating, I will risk the displeasure of the moderators by commenting on this off-topic.
It is true that different cars show some similar characteristics; however, by using different characteristics (number of doors, number of cylinders, carburator or feul injection) one can construct very different "family trees". However, when it comes to the Linnean classification, it appears that essentially the same trees always come about no matter which characteristics one uses to classify them. Unlike any classification scheme for cars, the heirarchical classification scheme does seem to indicate that there is some more profound organizing scheme that nature is using -- certainly more than some "common designer" is willy-nilly using common designs in randomly chosen species.
Here is a link that discusses the concept of nested heirarchies a little more. Douglas Theobald's entire essay here is my favorite web page; I highly recommend reading the entire thing.
Anyway, further discussion on this, if you are interested, should be in another thread.
Edited to try to add a subtitle.
This message has been edited by Chiroptera, 03-Jul-2005 03:21 PM

This message is a reply to:
 Message 174 by MrSmee, posted 07-03-2005 10:42 AM MrSmee has not replied

  
Chiroptera
Inactive Member


Message 196 of 284 (226851)
07-27-2005 5:23 PM
Reply to: Message 195 by jar
07-27-2005 5:15 PM


Re: What's good for the goose...
Indeed. Evolution is successful because it explains observed phenomena known in Darwin's time as well as discovered subsequently.
ID, on the other hand, starts off with a hypothesis (for which there is no motivation other than a dislike for "naturalism") and is now desperately looking of any kind of confirmatory evidence, whether it's Behe's embarassing attempts at "irreducible complexity" or Dembski's "specified complexity" lunacy.

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 Message 195 by jar, posted 07-27-2005 5:15 PM jar has not replied

  
Chiroptera
Inactive Member


Message 199 of 284 (226892)
07-27-2005 8:23 PM
Reply to: Message 197 by iano
07-27-2005 6:51 PM


Re: What's good for the goose...
quote:
Can a closed group of people get it very badly wrong?
Science is not a closed group of people. The number of biological scientists is far too large and the variety of people engaged in the biological sciences is far too great for me to believe that they are victims of the kind of "group think" that you are suggesting.

This message is a reply to:
 Message 197 by iano, posted 07-27-2005 6:51 PM iano has replied

Replies to this message:
 Message 203 by iano, posted 07-28-2005 5:49 AM Chiroptera has replied

  
Chiroptera
Inactive Member


Message 217 of 284 (227056)
07-28-2005 11:23 AM
Reply to: Message 203 by iano
07-28-2005 5:49 AM


Re: What's good for the goose...
Let me tell you something about how science works. There are thousands of people working in the biological sciences. They are working at thousands of colleges, universities, and research institutions, each one having their own hiring policies and their own tenure policies. They publish in hundreds of journals, each one with their own boards of editors and each one determining themselves what will be published. They are funded by hundreds of governmental and nongovernment agencies, each one with its own criteria for determining where there money goes.
So, what is the mechanism that keeps new ideas down, or that keeps the accepted propaganda going? You are going to have to actually present some evidence that it is because of "indoctrination" that ID is not being accepted.

This message is a reply to:
 Message 203 by iano, posted 07-28-2005 5:49 AM iano has replied

Replies to this message:
 Message 218 by iano, posted 07-28-2005 2:06 PM Chiroptera has replied

  
Chiroptera
Inactive Member


Message 223 of 284 (227122)
07-28-2005 2:32 PM
Reply to: Message 218 by iano
07-28-2005 2:06 PM


Re: What's up Indoc...?
quote:
Like, how does a science even begin to find out whether it is indoctrinated or not?
Scientists don't worry about a question like this. If and when a new idea is presented, either known data contradicts it, or it doesn't. It explains currently known data or it doesn't. These are not a matter of indoctrination. Facts are available to all, and the facts can be checked against what the theory says.
Then the new idea precicts new phenomena that should be observed, and then either these phenomena are observed or they are not. Again, it is not a matter of indoctrination. The new idea can be examined by anyone, and a prediction can be generated; this prediction can be examined by anyone to see whether it really logically follows from the new idea. Then anyone can design an experiment or observation program to see if the phenomena are observed. Again, indoctrination does not enter into it; the experiments are performed and the observations are made; either they are consistent with the predictions or they are not.
Again, ID is an idea that is out there. What does it explain? Behe's "irreducibly complex" systems have been shown to not be irreducibly complex, and in fact are reducibly complex in exactly the manner that evolution predicts.
What does ID predict? Dembski's "spedified complexity" is mostly a bunch of sophistry that has little relevance to the real world.
This is not a matter of indoctrination. It is a fact that ID explains nothing and predicts nothing. That is why it is not taken seriously as science.
Unless by "indoctrination" you mean that scientists should seriously consider ideas that cannot be empirically tested.

This message is a reply to:
 Message 218 by iano, posted 07-28-2005 2:06 PM iano has replied

Replies to this message:
 Message 232 by iano, posted 07-28-2005 4:46 PM Chiroptera has replied

  
Chiroptera
Inactive Member


Message 229 of 284 (227144)
07-28-2005 3:31 PM
Reply to: Message 228 by ringo
07-28-2005 3:25 PM


Re: In Doctor, In Nation.
quote:
Your example of Hitler disproves your own point. Hitler suppressed the intellectuals. He drove the Jewish scientists - e.g. Einstein - out of the country. He was trying to prevent the educated people from exposing his lies.
That's why I tried to explain the anarchic nature of the scientific enterprise. Indoctrination only works on such a large number of people if there is some centralized authority to enforce the indoctrination -- a centralized authority that does not exist in the sciences.
P.S. Cool avatar.

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Chiroptera
Inactive Member


Message 235 of 284 (227172)
07-28-2005 6:12 PM
Reply to: Message 232 by iano
07-28-2005 4:46 PM


What's the problem?
quote:
Which seems to indicate the reason that Science doesn't have to worry about indoctrination is that the 'Scientific Method' will tend to filter it out. When was this ever tested or is that a philsophical decision?
Well, the scientific method is just a codification of "common sense" -- pretty similar to how most people live their lives. The scientific method is basically the following:
1) The observation that universe behaves very regularly, that there are patterns to the phenomena;
2) that we can figure out how the universe works by studying the patterns;
3) we try to figure out how the universe by coming up with ideas that explain what we see; and
4) we test our ideas by noting what else we should see if these ideas are correct and then checking that we see those things.
Isn't this how you go about your life? Don't you see patterns in the way the world around you, or is your life simply a series of unrelated and unpredictable events? Don't you have ideas and beliefs that help you sort out the events that happen in your life? When something unexpected happens, don't you try to figure out how it fits into your beliefs, and if you can't do that don't you alter your beliefs or even chuck them in favor of new beliefs?
Maybe not -- people are different I guess. But this is such common sense to me that I'm surprised to find that people behave different. Maybe you can explain why you find the scientific method inadequate for explaining the world.
-
quote:
What experiment was ever carried out to see what effects mass indoctrination would have on the observational and conclusional characteristics of particular and very large group of scientists.
I think it has been done, in a fashion. At one time all European geologists were indoctrinated into believing that there was a global flood that occurred roughly 4000 years ago. When they searched for evidence of this flood, not only did they find no evidence but the results of their studies showed that the earth had to be millions of years old, at the very least. So I would say that indoctrination seems to have a rather limited effect when scientists are honestly searching and trying to learn about the world around us.
How about you? Do you have any evidence that "indoctrination" will prevent the scientific community from recognizing when its theories are incorrect?
--
quote:
: "We believe in Evo but we find that the theory of gradual evolution is troubled by the Cambrian fossils. What explains this??? Well, it could be punctuated equilibrium..."
First, if you are referring to the "Cambrian explosion", then punctuated equilibrium was invoked to explain this. The "Cambian explosion" is easily explained by noting that this "explosion" occurred over several tens of millions of years -- long enough to be accounted for by gradual evolution.
Second, punctuated equilibrium does not contradict gradual evolution. Punctual equilibrium simply postulates that the rate of visible evolutionary change varies from very, very gradual to just gradual. Even during the times of quickest evolutationary change, it is still gradual evolution.
Third, punctuated equilibrium was discovered by examining the data. The fossil record shows that the rate of evolutionary change was not constant for all species at all times. Before punctuated equilibrium, there was no reason to assume that the rate of change was constant. There was no scientific laws that required it to be constant. If constant rate of change was assumed, it was because it was the simplest assumption to make; but there was no other reason for this assumption and it was abandoned once the data showed that the assumption was flawed.
Finally, this is the way every scientific theory works. No scientific theory explains everything it is supposed to; every scientific theory has to contend with unexplained observations. It was discovered that the planet Uranus did not follow Newton's laws. Did this imply that there was a problem with Newton's laws? It was hypothesized that there was an additional planet whose gravitational attraction was affecting Uranus' orbit. Was this the result of indoctrination? You can call it "indoctrination" if you want, but it seems sensible to wait until other hypotheses are examined before simply abandoning a theory that has been wildly successful. Sure enough, the planet Neptune was discovered, right where Newton's laws said it should have been.
-
quote:
Who is in a better position to decide whether the stumpy protrusions; which may or may not be precursor legs on a fish' than a scientist whose life is dedicated to the evaluation of stumpy thing - ie: the evolutionary scientist.
Except that these "stumpy things" looked just like the theory of evolution predicted that they would look. That various degrees of "stumpy" -- from obvious fins to obvious legs and all manner inbetween -- have been found, just like the theory of evolution predicted they should be. That these various degrees of "stumpy" are found in the exact order in the fossil sequence -- more fin-like "stumpy" below more leg-like less"stumpy -- just like the theory of evolution says they would. That the fish possessing these "stumpy things" show other features that are in between fish and terrestrial vertebrates -- more fin-like = more fish-like in other characteristics, more leg-like = more amphibian-like in other characteristics, just like evolution says it should be.
It isn't as if people believe that evolution is true and then just try to fit random facts into it. For over 150 years evolution has made very definite predictions. These predictions did not have to be observed, yet they were. Various phenomena have been proposed that would disprove evolution -- these phenomena could have been observed but they haven't. And this is with thousands of scientists in different disciplines using different methodologies over a century and a half. I am still waiting for some evidence that this could be the result of "indoctrination".

This message is a reply to:
 Message 232 by iano, posted 07-28-2005 4:46 PM iano has not replied

  
Chiroptera
Inactive Member


Message 238 of 284 (227205)
07-28-2005 9:39 PM
Reply to: Message 237 by ringo
07-28-2005 8:37 PM


an unanswered question
quote:
And if other sciences happen to agree with evolution, it's because evolution is right, not because it holds some unholy sway over them.
Yes, it still hasn't been answered how do we tell whether scientists are convinced of evolution due to some indoctrination or whether they are convinced of evolution due to it being correct and all the data points to it.
Unless, I guess, the Holy Spirit tells you directly that Genesis is literal history.

This message is a reply to:
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Chiroptera
Inactive Member


Message 250 of 284 (227311)
07-29-2005 11:05 AM
Reply to: Message 244 by iano
07-29-2005 10:21 AM


once again, into the breech....
Let me repeat the nature of the scientific profession.
There are thousands of individuals working in the biological sciences, in many different countries, with many different cultural backgrounds, and many different religious experiences.
These individuals work at thousands of colleges and reseach intstitutes, each one with their own independent hiring and retention policies.
These individuals publish in hundreds of different journals, each one with its own independent board of editors that decides on their review processes and which papers to publish.
That these individuals are funding through hundreds of different governmental and non-governmental agencies, each one with their own independent review boards that decide who gets the money for their research.
Now, you are suggesting that this indoctrination that you keep going on about is so thorough that no one is able to break out of it and see that the evidence might suggest a different theory.
You are suggesting that this indoctrination is so thorough that this individual is unable to convince a significant number of other researchers that her ideas have merit.
You are suggesting that this indoctrination is so thorough that these researchers are unable to present their findings at professional conferences and get a public airing of their views.
You are suggesting that this indoctrination is so thorough that these researchers are unable to secure funding to investigate these alternative ideas further and to get their results published.
And you are suggesting all of this without providing any evidence that this is actually happening, or even that it is even possible.

This message is a reply to:
 Message 244 by iano, posted 07-29-2005 10:21 AM iano has replied

Replies to this message:
 Message 258 by iano, posted 07-29-2005 11:53 AM Chiroptera has replied

  
Chiroptera
Inactive Member


Message 260 of 284 (227333)
07-29-2005 12:00 PM
Reply to: Message 258 by iano
07-29-2005 11:53 AM


Re: once again, into the breech....
So, is this an admission that you don't have anything of substance to say?

This message is a reply to:
 Message 258 by iano, posted 07-29-2005 11:53 AM iano has not replied

Replies to this message:
 Message 261 by ringo, posted 07-29-2005 12:05 PM Chiroptera has replied

  
Chiroptera
Inactive Member


Message 262 of 284 (227344)
07-29-2005 12:08 PM
Reply to: Message 261 by ringo
07-29-2005 12:05 PM


Re: once again, into the breech....
Yes, I also noticed that he's awfully gleeful about wasting bandwidth.

This message is a reply to:
 Message 261 by ringo, posted 07-29-2005 12:05 PM ringo has not replied

  
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