FRDB Archives

Freethought & Rationalism Archive

The archives are read only.


Go Back   FRDB Archives > Science & Skepticism > Evolution/Creation
Welcome, Peter Kirby.
You last visited: Today at 03:12 PM

 
 
Thread Tools Search this Thread
Old 08-22-2004, 04:59 PM   #1
Veteran Member
 
Join Date: Dec 2003
Location: the west
Posts: 3,295
Default

And visit The Talk Origins Archive for information on evolution, including answers to what seems to be your questions.
anthrosciguy is offline  
Old 08-22-2004, 05:56 PM   #2
Contributor
 
Join Date: Apr 2003
Location: Gilead
Posts: 11,186
Default

Quote:
Further I concede occasionally a mutant or some other agent may cause change that is usually not beneficial but may on rare occasions be beneficial. I don’t recall anyone actually observe a mutation that later proved to beneficial enough that the mutation became encoded in the genes and then passed on so I am skeptical of that claim.
Prijambada, I. D., S. Negoro, T. Yomo and I. Urabe, 1995. Emergence of nylon oligomer degradation enzymes in Pseudomonas aeruginosa PAO through experimental evolution. Applied and Environmental Microbiology 61(5): 2020-2022.

Quote:
Through selective cultivation with 6-aminohexanoate linear dimer, a by-product of nylon-6 manufacture, as the sole source of carbon and nitrogen, Pseudomonas aeruginosa PAO, which initially has no enzyme activity to degrade this xenobiotic compound, was successfully expanded in its metabolic ability. Two new enzyme activities, 6-aminohexanoate cyclic dimer hydrolase and 6-aminohexanoate dimer hydrolase, were detected in the adapted strains.
New information. Beneficial mutation. Be skeptical no more.
Roland98 is offline  
Old 08-22-2004, 06:12 PM   #3
Senior Member
 
Join Date: Apr 2004
Location: Pinch (Charleston), WV
Posts: 654
Default

First off, thats not how evolution works. These "mutations" are very small ones that tend to acumulate over time. (every once in a while there is a "big" mutation but most species evolve due to a collection of "small" ones)

This is a real, real good site: http://www.ebonmusings.org/evolution/

I especially recomend this article: http://www.ebonmusings.org/evolution/whatevoisnt.html I think you may be confused with random chance or Single-step selection or the "tornado in the junkyard"; reguardless, I recomend the whole article, not jsut those two targets.

Hope you learn something,
1veedo
1veedo is offline  
Old 08-22-2004, 06:15 PM   #4
Senior Member
 
Join Date: Apr 2004
Location: Pinch (Charleston), WV
Posts: 654
Default

Quote:
...Packed within the nucleus of every cell of your body is a tightly wound double helix. DNA, deoxyribonucleic acid, is literally the instruction manual of life. This intricate, complex molecule contains all your genes, all the alleles that make you unique, encoded in a series of nucleotide bases that can be read by the cell's transcription machinery and converted into proteins that control the functions of life. Every time a cell in your body divides, the new cells must be provided with a copy of these instructions so that they know how to perform their specific duties. For this to happen, the DNA of the original cell must be replicated. The molecular machinery present in every cell does this job with a degree of fidelity that would put any human copyist to shame. Nevertheless, DNA is a long, complex molecule and the replication process is not perfect. Frequently, when DNA is copied, there are small errors, slight changes. A single nucleotide "letter" might be changed to another, or a segment of DNA might be deleted entirely, flipped end-to-end or added where one did not previously exist. These changes are mutations.

Most mutations are silent -- that is, they don't do anything at all. Of the non-silent ones, most are deleterious and impair the fitness of the organism that has them. Natural selection sees to it that these mutations are quickly eliminated from the gene pool. Those that remain -- a small percentage of all total mutations, but they definitely do exist -- are beneficial. In some way, even a small one, they contribute to the fitness of the organism that has them. Since organisms with this beneficial mutation have a survival advantage, they are selected for and tend to reproduce more abundantly than those without it. In this way, the mutation spreads throughout the population and eventually becomes "fixated" in the gene pool.

It is important to recognize that mutations are changes to the genome, the set of instructions that dictates how an organism develops. Therefore, every non-silent mutation makes the organism that has it slightly different from every other member of its species. It may be something as simple as a tiny alteration in the shape of a blood protein, or something as complex as a change to the skeletal and muscular structure that determines the body's ultimate shape. The point, however, is that each mutation makes the organism different in some way, and over thousands or millions of years, these differences add up. Eventually, as mutations spread and accumulate, a population of organisms may evolve to a point where it is considered to be a separate species from the population it descended from. This is called speciation or macroevolution, and contrary to creationist claims, it has been observed and documented. See Observed Instances of Speciation and Some More Observed Speciation Events. ...
I think this is specifically what you're looking for.
1veedo is offline  
Old 08-22-2004, 07:40 PM   #5
Veteran Member
 
Join Date: Dec 2003
Location: Atlanta
Posts: 1,077
Default

Quote:
Originally Posted by Andrew_theist
I believe the reason such meager evidence of evolution is parlayed into the grander claim of macro evolution is due to a commitment to a materialistic philosophy. After all if mechanistic processes are all that was available to create the species we observe then some form of evolution must be right.
If by 'commitment to materialist philosophy' you mean that scientists refuse to use the 'godidit' explanation, then you're at least partially correct. If a god entity can do anything, even bending or breaking well established laws (global flood? where did the water come from and where did it go?, etc.) and do it at anytime, then the predictive value of science is zero. If you drop a ball, you can predict when it will hit the ground, where it will hit the ground and how fast it will be going when it hits. Why can't an omnipotent god intervene? Science does not say god cannot intervene, but disregards the possibility because we cannot know a priori if he will or won't. Why is it we don't say ' If you drop a ball it will hit the ground unless god intervenes'?

This is, in my layman's view, the primary problem with viewing 'creation science' or ID as actual science. Neither has predictive value. If god can create a new species whenever he wants, where is the predictive value? it offers us no ability to do something more than we can already do.

I'm not sure why you think the evidence is meager. Perhaps you haven't really been exposed to the bulk of it. Read, study, ask questions, learn - I think you'll end up convinced. If evolution as a scientific theory is wrong, I think it will be shown wrong in a similar way that Newton's theory of gravity is 'wrong' (fails at relativistic speeds, but substantially correct). In other words, there may be a few details we don't understand, but it's basically correct.
Sparrow is offline  
Old 08-22-2004, 07:55 PM   #6
Veteran Member
 
Join Date: Jun 2004
Location: Charlotte NC
Posts: 2,038
Default

Quote:
I believe the reason such meager evidence of evolution is parlayed into the grander claim of macro evolution is due to a commitment to a materialistic philosophy. After all if mechanistic processes are all that was available to create the species we observe then some form of evolution must be right.
Strictly speaking, the fact that life evolves was derived from observation of the fossil record well before Darwin. It was already well know that past life on this planet differed markedly from current life and that succeeding periods in Earth's history had been marked by replacement of existing faunas by new ones. As spontaneous generation as a source for these new faunas had been pretty well ruled out by direct experiment, the most likely explanation for the observed fossil record was that the new faunas had evolved from the older ones. All that Darwin and Wallace did was independently arrive at an explanation of the mechanism driving evolution.

While it may be true that scientists have a distinct bias towards naturalistic explanations (quite reasonable given that science can only deal with natural phenomena), it is even more true that evolution is preferred because there is no better alternative. Flood geology simply does not match the observed evidence and if we assume some repeated catastrophism to explain the observations, we are left to ask how a perfect creator manage to keep getting it wrong and had to keep painting over his canvas. Darwinian Evolution is the best fit with the observed evidence and requires the fewest assumption. It is for that reason, and that reason only, that it remains the preferred view of science.
espritch is offline  
Old 08-22-2004, 09:06 PM   #7
RBH
Contributor
 
Join Date: Aug 2002
Location: Ohio
Posts: 15,407
Default

Andrew wrote
Quote:
I believe the reason such meager evidence of evolution is parlayed into the grander claim of macro evolution is due to a commitment to a materialistic philosophy.
Believing that makes it kind of hard to explain the thousands of scientists who are also Christians, some of them evangelical Christians, who accept that the theory of evolution is our best scientific exlpanation of the diversity of life on earth. They aren't committed to a "materialist philosophy."

RBH
RBH is offline  
Old 08-22-2004, 10:29 PM   #8
Veteran Member
 
Join Date: Jul 2002
Location: US east coast. And www.theroyalforums.com
Posts: 2,829
Default

Quote:
I believe the reason such meager evidence of evolution is parlayed into the grander claim of macro evolution is due to a commitment to a materialistic philosophy.
You're saying that in order to support atheism, scientists (who you seem to think are all atheists) are applying the evidence outside its actual area of application. This is getting rather close to accusing scientists of professional misconduct, if not outright fraud.
Albion is offline  
Old 08-22-2004, 10:36 PM   #9
Veteran Member
 
Join Date: Sep 2001
Location: Edmonton, Canada
Posts: 2,767
Default

Quote:
Originally Posted by Andrew_theist
I believe the reason such meager evidence of evolution is parlayed into the grander claim of macro evolution is due to a commitment to a materialistic philosophy. After all if mechanistic processes are all that was available to create the species we observe then some form of evolution must be right.
[/COLOR]
Hello Andrew,

I was just curious if you've read Talk.Origin's 29+ Evidences for Macroevolution: The Scientific Case for Common Descent by Dr. Douglas Theobald. If you have, then I would be flabbergasted at your assertion that the evidence for evolution is "meagre."

For an example, read the section on endogenous retroviruses. If we were created and didn't share ancestry with other primates, then why do we share the remnants of retroviruses in our genes, at the same chromosomal locations, with other primates? It's the equivalent of detecting plagiarism by noting the copied "mistakes" from the plagiarized source. I cannot fathom how you might consider this as "meagre" evidence. It's really a devestating smoking gun.

In addition, if you think a materialistic philosophy is necessary to accept evolution, then how do you reconcile that with the fact that many Christians (and even some evangelical Christians) accept evolution? I think it's more so a philosophical commitment to religious orthodoxy that keeps many people from accepting evolution rather than alleged problems of the evidence behind evolution.

Jason
KnightWhoSaysNi is offline  
Old 08-22-2004, 11:08 PM   #10
Regular Member
 
Join Date: Jan 2002
Location: Washington State
Posts: 272
Default

Hello all,

Quote:
Through selective cultivation with 6-aminohexanoate linear dimer, a by-product of nylon-6 manufacture, as the sole source of carbon and nitrogen, Pseudomonas aeruginosa PAO, which initially has no enzyme activity to degrade this xenobiotic compound, was successfully expanded in its metabolic ability. Two new enzyme activities, 6-aminohexanoate cyclic dimer hydrolase and 6-aminohexanoate dimer hydrolase, were detected in the adapted strains.
Does this mean something to everyone in this forum?

Quote:
Emergence of nylon oligomer degradation enzymes in Pseudomonas aeruginosa PAO through experimental evolution.
What does this mean? Doe this mean evolution was simulated to see how it works?

Quote:
This is a real, real good site: http://www.ebonmusings.org/evolution/
Do you really think this site is impartial and objective? Here is a short blurb on the philosophy of naturalism.

As stated before, naturalism is one of the basic principles around which all of science is organized. It states that supernatural causes and events must be ruled out; that everything that happens must have an understandable cause that is based on empirical evidence and obeys physical laws and causality.

Has this statement been proven scientifically? Is it a scientific fact that all phenomena must have a naturalistic explanation? According to this statement some form of evolution must be true because there is no other possibility. The author acts like to laws of physics are actual laws that must be obeyed. The laws of nature are merely observations of how matter behaves, unless the author is suggesting there is a forces that compels matter to behave as it does. If this is true only something outside of nature could force nature to behave in a certain pattern.

To put it another way, this scientist is not using naturalism: [A cartoon of mathematics with the writing ‘and then a miracle occurs]. This restriction to natural causes for natural events is what gives science its explanatory power. Divine intervention and miracles are ruled out; scientists cannot explain an event by saying "God did it".

I agree that scientists can’t explain how a phenomenon such as a computer works by saying God did it. But if the question were what caused a computer to exist saying intelligent beings designed and produced computers would have more explanatory power over some scenario of time and chance mindlessly creating computers.

They're not allowed to postulate that angels push the planets around in their orbits, or that insanity is the result of possession by malignant spirits, or that thunder and lightning are caused by angry deities, or, for that matter, that atomic nuclei are stable because tiny pink leprechauns hold the protons together. And, of course, the kicker, the one that gets creationists so upset: They're also not allowed to say, "Six thousand years ago, God created the heavens and the earth, and the beasts of the field, the fish of the sea, and the fowl of the air, and created he man in his own image." Such a statement would be unscientific. Not necessarily wrong - just unscientific. If supernatural events do occur, science cannot study or explain them.

And there is some law that says the universe must be explainable and subject to scientific study? Naturalism is really a tautology because any explanation for an event is going to be considered natural no matter what it is. I am happy to concede that natural events have natural causes. But how do we know the cause of life or the cause of the universe was natural causes?

Quote:
I especially recomend this article: http://www.ebonmusings.org/evolution/whatevoisnt.html I think you may be confused with random chance or Single-step selection or the "tornado in the junkyard"; reguardless, I recomend the whole article, not jsut those two targets.
Why would you recommend an article that so shamelessly has an axe to grind? Here’s the first paragraph.

Many people who argue against evolution do so because they do not really understand it. The straw-man caricatures of evolution commonly presented by creationists are indeed illogical, implausible and unscientific. But they are precisely that -- straw men -- and do not accurately represent evolutionary theory. As will be shown, when presented in its true form, the theory of evolution is not only simple and plausible, but the only model of biological development that is scientific and consistent with the facts.

Quote:
a small percentage of all total mutations, but they definitely do exist -- are beneficial. In some way, even a small one, they contribute to the fitness of the organism that has them. Since organisms with this beneficial mutation have a survival advantage, they are selected for and tend to reproduce more abundantly than those without it. In this way, the mutation spreads throughout the population and eventually becomes "fixated" in the gene pool.
I am aware this is how evolution works on paper. On paper these minute changes over vast amounts of time produced plants, giraffes and humans. The most common examples of evolution are light and dark colored moths and finches. In both cases pre-existing characteristics such as color and beak size determined the shifts in populations. When the conditions returned so did the population ratio.

Quote:
If by 'commitment to materialist philosophy' you mean that scientists refuse to use the 'godidit' explanation, then you're at least partially correct. If a god entity can do anything, even bending or breaking well established laws (global flood? where did the water come from and where did it go?, etc.) and do it at anytime, then the predictive value of science is zero. If you drop a ball, you can predict when it will hit the ground, where it will hit the ground and how fast it will be going when it hits. Why can't an omnipotent god intervene? Science does not say god cannot intervene, but disregards the possibility because we cannot know a priori if he will or won't. Why is it we don't say ' If you drop a ball it will hit the ground unless god intervenes'?
I am going to have to add Goddidit rationale to my list of most common atheist arguments. Of course science is the study of how things behave normally barring divine or human intervention. I agree if the universe is not uniform and predictable it would not be knowable by scientific means however there is no law or fact of science that all phenomena must be knowable by scientific means. I believe the reason science is works is because the universe was created by an intelligent designer which is precisely why it is uniform, predictable and subsequently knowable.

Quote:
This is, in my layman's view, the primary problem with viewing 'creation science' or ID as actual science. Neither has predictive value. If god can create a new species whenever he wants, where is the predictive value? it offers us no ability to do something more than we can already do.
In practice this is not true. Humans create things using intelligence all the time and such things can be studied using the scientific method. It’s called reverse engineering.

Quote:
I'm not sure why you think the evidence is meager. Perhaps you haven't really been exposed to the bulk of it. Read, study, ask questions, learn - I think you'll end up convinced. If evolution as a scientific theory is wrong, I think it will be shown wrong in a similar way that Newton's theory of gravity is 'wrong' (fails at relativistic speeds, but substantially correct). In other words, there may be a few details we don't understand, but it's basically correct.
The evidence for micro evolution is impressive. It’s the extrapolation to macro evolution that is meager. The evidence for micro evolution is often used to support macro evolution.

Quote:
Flood geology simply does not match the observed evidence and if we assume some repeated catastrophism to explain the observations, we are left to ask how a perfect creator manage to keep getting it wrong and had to keep painting over his canvas. Darwinian Evolution is the best fit with the observed evidence and requires the fewest assumption. It is for that reason, and that reason only, that it remains the preferred view of science.
At this point I am only critiquing current evolution theory as an explanation of the variety of species we see I am not offering alternative explanations. Slamming alternative explanations doesn’t make evolutionary theory correct.
Andrew_theist is offline  
 

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Forum Jump


All times are GMT -8. The time now is 10:52 PM.

Top

This custom BB emulates vBulletin® Version 3.8.2
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.