Site Search:
 
Speak Korean Now!
Teach English Abroad and Get Paid to see the World!
Korean Job Discussion Forums Forum Index Korean Job Discussion Forums
"The Internet's Meeting Place for ESL/EFL Teachers from Around the World!"
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Evolution Question (not a Creationist debate)
Goto page Previous  1, 2, 3, 4  Next
 
Post new topic   Reply to topic    Korean Job Discussion Forums Forum Index -> Off-Topic Forum
View previous topic :: View next topic  
Author Message
huck



Joined: 19 Jan 2003

PostPosted: Thu Apr 20, 2006 5:07 am    Post subject: Reply with quote

Physical evolution is something I have no problems with...it seems almost logical. Something is born with a mutated gene, or - more likely - a recessive gene that has become dominant and gives an edge to the individual in terms of surviving and, hence, reproducing. He/she could meet another individual with the same dominating recessive gene, and pass it on to their offspring, which would eventually make it a dominant gene.

But...

I assume (We're going to have to assume here, I think) that the earliest bees and spiders didn't make the perfect webs or hexagonal honeycombs. Maybe they felt a need to build something that would protect them, but it probably wasn't what we see today.

But somewhere down the line, a generation was born with the instinct to build things a certain way that their ancestors didn't build, such as how all garden spiders will build approximately the same kind of web. How and when would this instinct have become hard-wired?

Maybe it's physical evolution like some people are saying because the web that we see today gave the spiders the best chance to survive and reproduce. But if the first spiders didn't instinctively build the web like that - that's the big assumption - then I don't see how its offspring would eventually be born with knowledge that he/she didn't have...

(I actually read RTeacher's posting...I think those guys are like me where they have no clue what happened, but they have theories/thoughts/assumptions, and so they wrote a paper about their thoughts, which supposedly make their theories more legitimate....I disagreed with them, though.)
Back to top
View user's profile Send private message
csvfa



Joined: 17 Jan 2006

PostPosted: Thu Apr 20, 2006 9:53 am    Post subject: Reply with quote

Quote:
I believe in evolution


I don't think evolution is something you 'believe' in. It's a little like saying 'I believe in addition'. It's not a question of faith.

Every adaption that every organism has evolved does not need to be explicitly explained in order to prove the theory. Again it's a little like saying, "I believe in addition, but how does 1,000,000+1,500,000=2,500,000?" And expecting an answer along the lines of "Well, 1,000,000+1 = 1,000,001 and 1,000,001+1 ="... None of us can imagine in our heads one million things and one and a half million things being put together, and there being two and a half million things in total. Noone can imagine that. This doesn't mean, however, that 'addition' is nonsense.

Of course we can be curious about how certain adaptions evolved in history, like how humans came to walk on two legs, for example. But whether or not we are able to explain the evolutionary history of an adaption should not convince us of whether or not to 'believe' in evolution.

However, I'll go ahead and speculate about humans walking on two legs anyway, because it's fun Very Happy Here's a possible scenario:

There is a group of monkeys that walk on four legs. They eat, among other things, let's say, apples from apple trees. These animals can only reach the lower apples in the trees. Let's assume they can't climb the trees, maybe the branches are too weak. At some point, one monkey has a mutation which enables it to stand on its hind legs, and so reach more apples. This monkey will be at an advantage as it can get more food than the others. It will be more likely to produce offspring than other monkeys. The gene for 'standing on hind legs' will therefore spread throughout this particular monkey species population. Humans are descended from this monkey species and share the 'standing on hind legs' gene. Humans can therefore can stand on their hind legs.

Quote:
I can accept physical changes due to evolution, but I don't understand how behavior or imitation can eventually make it's way into the dna so that it's passed on to the offspring...


Behaviour doesn't "make its way" into DNA. Behaviour is passed on, in genes, which are made from DNA. For example, the behaviour of spiders making webs. If there is a spider that makes webs and a spider that doesn't, the one that makes webs is likely to produce more offspring. The gene for 'webmaking' (made out of DNA) will therefore spread through the spider population.

How spiders came to make webs in the first place is a different question.



Prof Richard Dawkins is a hero of mine and my understanding of evolution is really down to his books. I'd highly recommend reading "The Selfish Gene" and/or "The Extended Phenotype" if you're interested at all in evolution.
Back to top
View user's profile Send private message
Xerxes



Joined: 10 Jan 2006
Location: Down a certain (rabbit) hole, apparently

PostPosted: Thu Apr 20, 2006 10:22 am    Post subject: Reply with quote

So...I always wondered why I was so weird and how my genes were evolved that way. This also describes many of us Dave's posters (see "Quotable Quotes from Dave's posters", for example)

I make crass jokes using the least number of profanities (as kinda game), and I've always had drinking buddies but not the wench variety. I actually use a lota profanities too sometimes, but tastefully like: the first thing I recently made a point of asking a long missed bud upon a chance meetin is, "Hey, buddy! So do you still masturbate lefty and farm your ducks like you used ta? [turns around in surprised recognition] Great to see you, man!" But, the devotchka around whiplash-scowl at us.

I mean, my forepeople musta gotten smacked around a lot at first from buds and broads alike until we were almost X-tinct. Then some reproductively viable, proto whack-job in our primordial down days recognized our collective wit as sexy, and this was when we were rescued from natural-selection/potty-mouth censorship.

And, boy, this babe did us all proud by having us multitudes of progeny.

To wit, I too am married with child! What gives? Why do we always have deviant motor mouths among us who do, on occasion, get the girl? How did our first get recognized when only talking it up with half-wit and obnoxious distaste at first? How did we survive the lean years? (A fly with half a wing and behavior passing.) And, to add to the puzzle, we are a recessive trait occurring once in a generation or so, but never quite stomped out. Misunderstood, as it were, were we not?
Back to top
View user's profile Send private message
huck



Joined: 19 Jan 2003

PostPosted: Thu Apr 20, 2006 1:41 pm    Post subject: Reply with quote

Hmm....here's a behavioral question...

Let's say we have a cage with mice, and if they push a button, they receive food, ala Pavlov. They quickly learn how to do this, and they live fat, happy lives. Their offspring also learn how to do it, either by imitating the other mice or by luckily stumbling upon the "magic food button", and they too live happy lives.

If we had the time to raise a thousand or a million generations of mice, do you think that eventually it would become instinct for mice to push a button for food? If after a thousand/million generations, we took a newly-born mouse litter and put it into a cage with a button, do you think it would now be instinct? (Of course, we'd have to set it up so that they couldn't hit it by random chance and control the other factors, etc. etc.)
Back to top
View user's profile Send private message
out of context



Joined: 08 Jan 2006
Location: Daejeon

PostPosted: Thu Apr 20, 2006 3:20 pm    Post subject: Reply with quote

To make it more evolution-like, you would probably have to provide only a limited amount of food that rewarded the faster button-pushers and left the slower ones to starve.

The experiment as you describe it doesn't present any survival advantage, so I would guess that in evolutionary terms (all other things being equal), you wouldn't notice any real change.
Back to top
View user's profile Send private message
Rteacher



Joined: 23 May 2005
Location: Western MA, USA

PostPosted: Thu Apr 20, 2006 4:17 pm    Post subject: Reply with quote

I'll continue to play the role of devil's - er God's - advocate:

"... All too often scientists forcibly assume [albeit incorrectly] that their laboratory experimental evidence can be applied elsewhere under different circumstances. Further, almost all currently accepted theories of Creation and Evolution are unverifiable and often contradicted by reliable evidence. However, when concepts such as consciousness, a creator intelligence and soul are introduced as viable concepts, the scientists demand that they be detectable by experimentation...

...Later, scientists revised Darwin's theory with their "Punctuated Equilibrium" evolutionary theory, supposedly making evolution invisible in the fossil record. Yet this theory is not verifiable in any way. It is indeed strange that scientists speak with absolute conviction of Darwin's Theory of Evolution, when it has been calculated that out of one billion species that have lived since the Cambrian period, that 99.9% of these species left no fossil record, thus leaving scant evidence (some of which is contradictory) to support this theory...

... There are innumerable anomalies in the archeological artifacts, such as: Human remains have been found from the wrong time period in the wrong continent, pollen of flowering plants from the wrong time period, etc —which sharply contradict this theory of evolution. These contradictions are either brushed aside by traditional evolutionists or rejected...

... The modification of species by breeding has been heralded since the time of Darwin as evidence of evolution, yet experiments have shown that there are natural limits to the changes which can be brought about by breeding. Experiments with plums and roses by the eminent biologist Luther Burbank confirmed these limits, "In short, there are limits to the development possible." ...

... A staunch advocate of evolution, Ernst Mayr of Harvard University found similar results in his experiments with fruit flies. Some altered species died out while others reverted to their original state a few years and generations later. These results show a strong anti-evolutionary characteristic in the species examined...

...Domestic animals have not evolved in four to ten thousand years. "Ten thousand years of mutations, crossbreeding, and selection have mixed the inheritance of the canine species in innumerable ways without its losing its chemical cytological [cellular] unity. The same is observed of all domestic animals: the ox [at least 4,000 years old, the fowl (4,000), the sheep (6,000), etc." ...

... It has been found that ancient Egyptian pyramids contain depictions of various species of animals which remain unchanged to this day. Why have the species not evolved?...

... Evolution theory fails miserably to account for complex form. How can small sequential changes over many generations improve the survivability of each generation such that these changes develop? It seems that the intermediate steps would decrease the species fitness rather than increase it. However, this would simply not take place unless each successive stage provided some definite advantage over the previous stage. Otherwise, the changes cannot be attributed to natural selection. A particularly vexing question is that of the evolution of the eye in previously sightless species. Darwin himself admitted this shortcoming of his theory, "To suppose that the eye with all its inimitable contrivances for adjusting the focus to different distances, for admitting different amounts of light, and for the correction of spherical and chromatic aberration, could nave been formed by natural selection, seems, I freely confess, absurd in the highest degree." ...
http://www.gosai.com/science/failure-of-science.html
Back to top
View user's profile Send private message Yahoo Messenger
Moldy Rutabaga



Joined: 01 Jul 2003
Location: Ansan, Korea

PostPosted: Thu Apr 20, 2006 4:37 pm    Post subject: Reply with quote

I think that we do believe in evolution, but in a narrower sense of the word; not that we have an emotional investment, but that we accept that something we can't prove is most likely true. I suppose the 'belief' is still different from a religious belief as it has more of a factual basis of evidence rather than spiritual, but I suppose very strictly speaking, we can believe that evolution happened, but we can't know because no one was there to record it.

I brought up a point that I didn't define very well, but so far we've only spoken about genetic changes and not about behavioral changes being handed down. If animals learn by imitating their parents and other animals, then the hamster who pushes a button can also pass it down to his children because they observe their father pushing the button. Thus a behavior could become a part of a species' activities even though it's not ingrained biologically. It is indirectly, because smarter hamsters are capable of learning from their parents, but the adaptation isn't built in. We don't have DNA programming to make fire or write or surf the net, but these are social adaptations we have learned.

Ken:>
Back to top
View user's profile Send private message
khyber



Joined: 16 Jan 2003
Location: Compunction Junction

PostPosted: Thu Apr 20, 2006 5:24 pm    Post subject: Reply with quote

I had a post lost to pbhh.
oh well..

huck: not a bad question.
but i think O.O.C answered pretty well. Simply making one fat doesn't provide a survival advantage.

Also, living in a laboratory doesn't allow for natural selection and THAT is hte basis for evolution. A trait has to be proven to be an advantage before it would become part of a species' behaviour pattern (that advantage is proven by survival). That ALSO means that inferior strategies would have deterious effects (like death).
In your eg: choosing "no food" is not really THAT bad of a thing. Because there are only two options....there is no immediate threat to the individual...there are no external pressures of any kind.

I wouldn't say it is a scientifically VIABLE idea to compare the TRUTHS of 1+1=2
to the theory of evolution.
YES, it has so obviously happenned, but that does not mean there are still problems in the theory.

re: two legs:
I had heard somewhere that the two legs came about because it was advantageous in escaping predation (faster i think...).

i'm more appreciative of SJ gould and EO Wilson
Back to top
View user's profile Send private message
Rteacher



Joined: 23 May 2005
Location: Western MA, USA

PostPosted: Thu Apr 20, 2006 5:36 pm    Post subject: Reply with quote

I think it's not so much "survival of the species" as it is "survival of the theory" ... In the true cheating spirit of myopic so-called scientists, some wannabe evolutionists on this forum choose to safely ignore (after being burnt a little - or finding themselves in an "unknown zone"...) any posts that offer anomalous evidence and reasonable arguments they have no good answer for ...
Back to top
View user's profile Send private message Yahoo Messenger
out of context



Joined: 08 Jan 2006
Location: Daejeon

PostPosted: Thu Apr 20, 2006 7:31 pm    Post subject: Reply with quote

Yes, I agree. It is thoroughly myopic to demand some substantiation and verifiability for concepts such as consciousness, creator intelligence and soul. My impression (and I admit that I don't know you as a person) is that you are a naturally dogmatic person who can only really understand things in terms of dogma, and projects it upon other people in order to form an understanding of their behavior in terms of your own beliefs.

Science does not offer the ready-made answers that religion does. Scientific discoveries to date represent only the tiniest fraction of what there is to know in the physical universe. I can think of no area of science where definitive and indisputable answers are available for all possible questions. It isn't going to happen in my lifetime, and in all likelihood it isn't going to happen as long as there are humans around to inquire. The theory of evolution does not provide a consistent and 100% verifiable line the way that religion does. If it's security and a grand unified theory of everything that you're looking for, I encourage you to pursue religion, because that's where you're going to find it, not in science.

Scientists are humans and are subject to error and bias. The principles of scientific inquiry represent an ideal to which, in my estimation, exactly no one individual can live up to. No two scientists are going to look at the same piece of evidence in exactly the same way. Fights and egotistical stubbornness are rampant in scientific research. Furthermore, scientists are influenced by the values and beliefs with which they were raised; one may strive to be completely objective, but it's not a battle that can be completely won. And it's completely plausible to accept a scientist's theories while believing that that scientist was a flawed and unreliable person in other respects. In the end, science is not about prophets or about personalities; it's about the theories that answer the most questions based on what we can verify. If you want a person or a figure to look up to, I encourage you to pursue religion, because that's where you're going to find it.

It is absolutely scientific to point out inconsistencies in the interpretation of available evidence. That's a basic function of how science works; theories are always being changed to accommodate more information. What is not scientific is saying, "Look! A contradiction! So you see, my theory with unverifiable, unclearly defined predetermined concepts must be correct."

And in answer to this:
Quote:
...Domestic animals have not evolved in four to ten thousand years. "Ten thousand years of mutations, crossbreeding, and selection have mixed the inheritance of the canine species in innumerable ways without its losing its chemical cytological [cellular] unity. The same is observed of all domestic animals: the ox [at least 4,000 years old, the fowl (4,000), the sheep (6,000), etc." ...

... It has been found that ancient Egyptian pyramids contain depictions of various species of animals which remain unchanged to this day. Why have the species not evolved?...

Is this for real? It sounds like Veruca Salt: "I want to see evolution NOW!!!" Four to six thousand years is a fraction of a second in terms of the time scale required to see any substantial changes in animals with the generational cycles of dogs, oxen, fowl and sheep.
Back to top
View user's profile Send private message
laogaiguk



Joined: 06 Dec 2005
Location: somewhere in Korea

PostPosted: Thu Apr 20, 2006 8:08 pm    Post subject: Reply with quote

Two words,
pedigree breeding
Back to top
View user's profile Send private message
Rteacher



Joined: 23 May 2005
Location: Western MA, USA

PostPosted: Thu Apr 20, 2006 9:47 pm    Post subject: Reply with quote

Among the human imperfections that scientists are beset with is the tendency to cheat. Of course, there are vested interests in terms of grant money and prestige that require cover-up and denial of the extent to which cheating (ala Prof. Huang...) is prevalent in the scientific community...

As far as not being "emotionally attached" to their results - that's a bunch of shyte. Ever since indignities suffered by Gallileo et al at the hands of corrupt organized religionists, the scientific community in general has held a grudge against religion and extended it to God (who big atheistic scientists are envious of ...)

Getting back more specifically to the topic of evolution, an example of the kind of biased suppression of evidence that has perpetuated - at least popularly - the weaker parts of Darwinian theory (relating to the origin of man) is William H. Holmes, anthropologist at the Smithsonian Institution, discrediting of the Caleveras skull and anomalous stool tools discovered in California gold mines:

"If these forms are really of Tertiary origin, we have here one of the greatest marvels yet encountered by science; and perhaps if Professor Whitney had fully appreciated the story of human evolution as it is understood to-day, he would have hesitated to announce the conclusions formulated, notwithstanding the imposing array of testimony with which he was confronted." In other words, if the facts do not fit the favored theory, the facts, even an imposing array of them, must go...
http://www.mcremo.com/door9.htm

For those who dare enter, here's a link to "The Museum of Forbidden Anthropology": http://www.mcremo.com/museum.htm
Back to top
View user's profile Send private message Yahoo Messenger
csvfa



Joined: 17 Jan 2006

PostPosted: Fri Apr 21, 2006 1:52 am    Post subject: Reply with quote

huck wrote:
Hmm....here's a behavioral question...

Let's say we have a cage with mice, and if they push a button, they receive food, ala Pavlov. They quickly learn how to do this, and they live fat, happy lives. Their offspring also learn how to do it, either by imitating the other mice or by luckily stumbling upon the "magic food button", and they too live happy lives.

If we had the time to raise a thousand or a million generations of mice, do you think that eventually it would become instinct for mice to push a button for food? If after a thousand/million generations, we took a newly-born mouse litter and put it into a cage with a button, do you think it would now be instinct? (Of course, we'd have to set it up so that they couldn't hit it by random chance and control the other factors, etc. etc.)


The answer to your question is no. Behaviour does not magically seep into DNA. There is nothing magic about evolution. If the mice are not genetically programmed to press the food button (or in other words do not have a gene for 'pressing the food button') then they will not know how to do it unless they have learned it themselves, even if their ancestors knew this behaviour.

On the other hand, if a random mutation occured at some point which resulted in a mouse pressing the food button by instinct, then it would have a gene for food button pushing. If this gene gives it a better chance of survival and helps it to produce more offspring (it may not under the particular conditions of your hypothetical experiment) then the gene would be likely to spread through the population. Mice with the food button pushing gene would have an advantage over mice without the gene, as they do not have to learn the behaviour (learning the behaviour costs time and energy). Therefore the button pushing mice will do better, produce more offspring and the this would continue until, all other things being equal, the entire mouse population many generations later would have the food button pushing gene.

So you see the behaviour never 'seeped into the DNA'. It was just that mice with the gene produce more offspring than those without it.
Back to top
View user's profile Send private message
huck



Joined: 19 Jan 2003

PostPosted: Fri Apr 21, 2006 8:46 am    Post subject: Reply with quote

Ok...I've realized the question I initially meant to ask....and I'm not intentionally being obtuse here...I'm just trying to wrap my brain around a thought I had last weekend.

How do you know that a random mutation is always just a random mutation? What if what scientists sometimes see as a random mutation is really a responsive change in the DNA due to experiences of the host body? For instance, if only one individual experiences a random mutation, then I'll believe that it's just random. But what if several non-related (in the familial sense) individuals experience the same random mutation during a simliar period of time? Then it doesn't appear to be too random anymore.

I know that mutated genes occur, but there's no concrete evidence that it's the only way for evolution to happen, is there?

I could be wrong, but are the mechanics of evolution as clear-cut and documented as some people profess?
Back to top
View user's profile Send private message
shortskirt_longjacket



Joined: 06 Jun 2004
Location: fitz and ernie are my raison d'etre

PostPosted: Fri Apr 21, 2006 9:54 am    Post subject: Reply with quote

huck wrote:
Ok...I've realized the question I initially meant to ask....and I'm not intentionally being obtuse here...I'm just trying to wrap my brain around a thought I had last weekend.

How do you know that a random mutation is always just a random mutation? What if what scientists sometimes see as a random mutation is really a responsive change in the DNA due to experiences of the host body? For instance, if only one individual experiences a random mutation, then I'll believe that it's just random. But what if several non-related (in the familial sense) individuals experience the same random mutation during a simliar period of time? Then it doesn't appear to be too random anymore.

I know that mutated genes occur, but there's no concrete evidence that it's the only way for evolution to happen, is there?

I could be wrong, but are the mechanics of evolution as clear-cut and documented as some people profess?


One of the big problems with studying evolution is that, while fossil records provide a relatively clear picture of what an animal's physical characteristics are, it doesn't give us any record of the genome. In order to understand how the genetics changed from one generation to the next, we'd need intact chromosomes, and those are just too hard to come by. So scientists aren't totally sure about how certain genes evolved, and when, and whether they happened simultaneously in different populations.

One thing that science is really up-front about is their lack of empirical knowledge in certain areas, like the genomes of fossilized creatures that are "missing links". Scientists don't know exactly how things happened, but they've got some good guesses and they keep working within the scientific method until they come across new data.

That's how science works. That's all that science can offer. I think that's why science is reviled by some people...because people want answers to questions rather than being content to say, "We really don't know right now...someday we hope to know, but right now our knowledge is limited."

For whatever reason, that's a really uncomfortable place for some people.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Korean Job Discussion Forums Forum Index -> Off-Topic Forum All times are GMT - 8 Hours
Goto page Previous  1, 2, 3, 4  Next
Page 2 of 4

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


This page is maintained by the one and only Dave Sperling.
Contact Dave's ESL Cafe
Copyright © 2018 Dave Sperling. All Rights Reserved.

Powered by phpBB © 2001, 2002 phpBB Group

TEFL International Supports Dave's ESL Cafe
TEFL Courses, TESOL Course, English Teaching Jobs - TEFL International