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Natural selection

You can't just ignore the behaviour of the entities that are borne out by the chemical processes that chain their way from genome to phenome. It is ultimately the phenome that is selected - not the genome. And whilst the phenome strongly reflects the nature of the genome it is also strongly reflective of the environment in which it finds itself.

In other words people's behaviour determines what genes are carried into the next generation but genes and the environment and the expression of the genes determine people's behaviour.

Yeah, NOVA had an interesting special on human epigenetics. I found the part on trans-generational effects especially interesting. See http://www.pbs.org/wgbh/nova/transcripts/3413_genes.html, about halfway down, with Bygren and Pembry - the incidence of diabetes seems to be related to the nutritional status of the paternal grandparent.

If you have a subscription to the European Journal of Human Genetics (or access to a library computer), you can find some hard data at:
http://www.nature.com/ejhg/journal/v15/n7/abs/5201832a.html .


Gate2501 said:
I simply hadn't thought of passing on ones genes, or the perpetuation of the genetic line, via the effects on one's siblings and relatives children.
Works for social insects.

delphi_ote said:
In an effort to be as clear as possible, there is not a general purpose "wealth" gene that can be inherited. Wealth is an abstract social concept, and there are many complex factors interacting that cause a person to be considered rich or poor. Nature cannot in general select for "fittest" in terms of wealth. Societal pressures cause whatever differences in reproduction we see in rich versus poor.
Perhaps not wealth itself, but the behaviors that lead to accumulation of material goods - hoarding, foraging, impulse control, for example, can be selected for. Consider the implications of this work : http://www.eurekalert.org/pub_releases/2004-12/uom-ibm120604.php .
 
You mean aside from the human proclivity for ritual, given our social brain's ability to misfire and treat inanimate objects, and the universe at large, as something that is amenable to social actions - such as pleas and propitiation? Aside from biological altruism, in which social animals contribute to the survival of the species at large by making non-reproductive contributions to their societies? For centuries, monasteries were centers of learning and trade, and were often the focal points for village or city life. Churches and monasteries acquired fabulous treasuries, and wielded great influence, and more than one monk or priest was attracted to the institution by the influence they would thus gain for themselves and their families. Does the name Borgia ring a bell?

I understand what you're getting at, but I disagree...

When you use Darwinian theories to explain societal phenomena, you open a huge can of worms...
 
We will have to disagree, then... For all practical purposes, we are all reproductively fit.
Are we now? Everyone is fertile, everyone has a sex drive, everyone's sex drive is directed towards the opposite sex so that reproduction is easy, and everyone gets the exact same number of children as everyone else... Children which of course all grow up to be perfectly healthy and never die before having children themselves...

Sorry, I don't think that is true. Some people have higher chances to survive and produce viable offspring than others. As long as that is true, natural selection will be with us.
 
You are wrong.

JREF is here for the purpose of education.

The participants in the JREF forum are here for a multitude of reasons.

Only some of us are here to educate.

The education of others is not my reason for being here. I'm here for some community. This is the only forum that I participate in.

There are occasions when I know something that most others do not, and I enjoy sharing things, so I do a bit of 'education'.

I do not, however, regard myself as being, in any way, obligated to spend time on a lot of the people that visit here - their agendas, deportment, nastiness, or foolishness make them unworthy of any of my time (apart from an occasional jab).

Ditto.
 
From the moment that we are all reproductively fit, Darwinian theories stop applying.

No. Ignoring the obvious point that not everyone is capable of reproducing at all, you are missing the even more important point that even if everyone is reproductively fit, that does not mean they are equally fit. Evolution doesn't work as black and white "this one is right and survives, this one isn't and doesn't". It works with "this one is slightly better and therefore has a higher chance of passing it's genes on to the next generation". As long as there is genetic variation, there is natural selection. We can mess with the environment and selection pressures, we can change them so fast that the pressures push us in a different direction every generation, but the selection will always be there. Until humanity becomes a big pile of identical clones, Darwinian theories will always apply.
 
Dear all

you are, of course, correct... I seem to have suffered from an acute case of disconnection between my brain and my fingers, and you have my apologies.

As it was pointed out, humans (as biological entities) are still evolving, and will be independently of my perception of selection pressures. Even if, has Cuddles mentioned, the human population was made of identical clones, random mutations would still drive evolution.

My attempted argument was concerned with the use of Darwinian theories to humans as social entities. Wowbagger claimed that any aspect of life can be explained by evolution. I agree in what concerns biological life, but I have to disagree when it comes to human society.

We can of course find some similarities, and use biological terms as metaphors for some of the social processes that we observe. However to claim that they are explained by evolution is, IMO, over-stretching the term. For one, it reduces the importance of one of the major drives of social change, conscious individual action.

More on this later... Meeting to atend

Again, my apologies
 
Wowbagger claimed that any aspect of life can be explained by evolution.
Wowbagger was wrong. There are huge parts of biology that can be explained quite well without any evolutionary thought, period. You could shoe-horn an evolutionary explanation into anything biological, but that wouldn't be good science.

A few years back, I went to an anti-evolution presentation on campus; ended up sitting with a few other grad. students from the biology dept. I thought I was sitting with like-minded folks.

At the end (which included the usual nonsense - he tried to show that a line drawn between two points, the current population and the population in th 1800s, intercepted at 2 just when the Bible says Adam and Eve were out and about), one of the grad students commented "Wow, he's good".

And it struck me; the professor he was working with (and who was also at the presentation) had listed his name, along with many other faculty, including the microbiologist who was on my thesis committee, on ad in the campus paper; this was ad giving students resources about people to take to about Jesus (or something to that effect).

These grad students were immunologists, parasitologists, microbiologists; they could do good and useful research, contribute to our understanding of life and yet still not necessarily accept the principles of biological evolution.

I have three human physiology text books on my shelf; none list evolution in the index. I have a plant physiology text, it lists two entries under evolution. When I lectured on plant physiology a couple years ago, I can't say I talked about anything in terms of evolutionary principles; I might have in an off-hand way, because it's just part of my thinking, but I don't think I made a point of it.

We can of course find some similarities, and use biological terms as metaphors for some of the social processes that we observe. However to claim that they are explained by evolution is, IMO, over-stretching the term. For one, it reduces the importance of one of the major drives of social change, conscious individual action.

You might read this : http://www.pnas.org/cgi/content/full/105/9/3416
 
Wowbagger was wrong. There are huge parts of biology that can be explained quite well without any evolutionary thought, period. You could shoe-horn an evolutionary explanation into anything biological, but that wouldn't be good science.

Yes, if you take them as a given. But you do need evolution to understand how the structures and processes came about. That is how I took Wowbaggers comment.


I will, thanks
 
Just found this (yes, I often read threads frm the bottom):

well this is the nub of it. No evidence, just faith in what will supposedly happen according to the theory. The rate of mutations in the fruit flies was increased by IIRC 5000%, so that's already speeding time up by 50 times, and on millions of generations of flies. In human terms that would be what?... hundreds of millions of years. And still nothing that is not a fruit fly.

Here is an(other) oft used strawman: "Scientists have tried hard to mutate the fruitfly into something else".

Wrong. The many, many mutation experiments done on fruitflies have not been made to change them. They have been made to map their genes. You see, the fruitfly is an excellent object for that. Cheap and quick to breed, easy to handle, and most importantly, has only 4 chromosomes, and big and visible ones at that. The ideal guinea-pig.

But as long as all experiments were made as first-generation mutations, i.e. mutated versions were not bred, then of course we won't observe much speciation.

When mutations are intensively selected, thus pushing the organism towards the 'species barrier' (for pedants, please substitute a word for species, which will convey what you know I mean)... and then the flies in question are left to their own devices within 2 or 3 generations they migrate right back to the centre.

Which, perhaps a little surprisingly, confirms evolution: As soon as you let them be fruitflies, they do just that. After all, they are perfectly suited for it, so why change? There is a great deal of stability in any species (otherwise they would speciate all over the place, all the time), so when you remove the selection pressure, they converge on status quo.

Fruit flies that had no eyes, within a couple of generations their offspring have eyes again.

Yes, unless we had also forced them to live in perpetual darkness.

Think about it like this. It's like you blowing through a straw at a golf ball in a salad bowl. You might, with great effort, move the ball away from the centre, and up the side a bit... but when left to its own devices the golf ball returns to the centre of the bowl.

Yes, but nature sometimes continue to blow: Habitats change forever.

Hans
 
Yes, if you take them as a given. But you do need evolution to understand how the structures and processes came about.
That's been a pet peeve of mine - conflating biology, natural history and evolution.

Natural history is, arguably, a subset of biology - but it also draws from geology and other earth sciences. And as a historical science, you can't really apply the same methods that you'd learn in experimental biology. In this, it's a lot like climatology; and for the same reasons you find competent scientists not willing to accept either theory, evolution or global warming.

A lot of what people point to as evidence for evolution are simply observations from natural history - the fossil record, for example. That's backwards, I think; evolution is the process that best explains the observations from natural history.

But, as I said above, you can do a lot of biology independent of natural history. So, a statement as absolutist as "any aspect of life", to be blunt, simply annoys me. Maybe I'm being pedantic, but it seems to me to confuse important differences between biology and natural history.
 
Here is an(other) oft used strawman: "Scientists have tried hard to mutate the fruitfly into something else".

Wrong. The many, many mutation experiments done on fruitflies have not been made to change them. They have been made to map their genes. You see, the fruitfly is an excellent object for that. Cheap and quick to breed, easy to handle, and most importantly, has only 4 chromosomes, and big and visible ones at that. The ideal guinea-pig.

But as long as all experiments were made as first-generation mutations, i.e. mutated versions were not bred, then of course we won't observe much speciation.

Interesting that no one caught that. Thanks, Hans.
 
Wowbagger was wrong. There are huge parts of biology that can be explained quite well without any evolutionary thought, period. You could shoe-horn an evolutionary explanation into anything biological, but that wouldn't be good science.
Yes, of course you could explain stuff without using evolution. My point was that adding evolution to an explanation helps us discover more about it!

For example,
We could describe genes in purely Mendelian ways, using terms such as "recessive" and "dominant" characteristics. However, when we apply Evolution by Natural Selection, we can explore precisely why one characteristic is dominant over the other. And, we can then apply that to make more precise predictions in population dynamics, than Mendel alone.

Scientists are not out to shoehorn evolution into every nook and cranny, for no reason. They apply evolution to problems, because it is a useful framework for making new discoveries.

Evolution does not necessarily need to replace other discoveries, no more so than Relativity "replaced" Gravity. Various models work at various levels. As long as there is no contradiction, they can all be team players in the quest for scientific discoveries!

I have three human physiology text books on my shelf; none list evolution in the index. I have a plant physiology text, it lists two entries under evolution.
I think you discovered a new form of fallacy: Argument from What Happens to be On My Bookshelf. :D

For some reason, I get the sense that the paper you linked to supports my arguments, not yours.

From the "Results and Discussion" section of the abstract:
What do these results suggest about cultural evolution? First and foremost, they support interpreting cultural change from an evolutionary perspective by demonstrating a theoretically based pattern (i.e., that characters tested against the environment evolve at a different rate) that could be used to understand or predict cultural change in other instances. This finding does not mean that cultural change comes about through genetic evolution. It simply means that despite the different ways in which cultural traits are transmitted, predictable evolutionary mechanisms may contribute to resulting patterns of change.
Sounds like a case for... memes!!

Evolution can explain aspects of culture! Though, we realized a long time ago, it is not all necessarily genetic evolution. It is still Darwinian, in the sense of memetics.

Random does not mean uncaused? And I can't think of anything a layman would call random that is uncaused. So I am not sure what you're getting at.
My usage of the term random, in that context, meant "completely unpredictable", and therefore "causes can not be deduced, and are therefore irrelevant".

It is a usage I have seen many a creationist try to assert, as an argument against Evolution, as if Evolution was really that random.

Evolution is neither Random Chance nor Intelligent Design. It is a natural algorithm, and one that is ultimately inevitable to pop up in the Universe.

That isn't so. There is nothing theoretically determistic about the theory of evolution. Some models create highly determistic results when the model uses simplified fitness scapes, and relatively stong environmental bias towards certain genes. (The blind watchmaker youtube video, occasionally linked to on this forum, has a 100% bias on the best timekeeper).
I would respond by saying there is a difference between the models, and the nature of reality. Our models could be deterministic or not. But, unless demonstrated otherwise, there is little (if any) reason to go off assuming something is not ultimately deterministic in nature, even if we can never quite get at it.

In theory you can model evolution many different ways, but if you want to reflect the reality the model will not be deterministic.
You have to demonstrate, to the same degree Heisenberg did, that something is not deterministic, before most of science will give up on something not being deterministic.

That complex systems randomness is a product of ignorance is untrue. One can know the precise state of every particle in a system, and still not be able to predict the system state at a later time. If the system is sufficiently complex, the variation in your expected output is actually incredibly high. The fundamental unpredictability of such a system is not a product of ignorance.
Perhaps we should start a thread on Chaos Theory to discuss this, further.

You should rephrase this. Some theoretical models of evolution are deterministic.
Duly noted.

Is a computer a "complex system"?
In the sense of mathematical complexity, of the type Wowbagger is implying? No.
dako, I was referring to complex adaptive systems, not systems that are merely complicated.

Computer hardware* is not adaptive. Most software in common usage, is not, either. But, some software can simulate the characteristics of complex adaptive systems, such as certain adaptive AI algorithms.

(*conventional hardware, that is. Not counting any of that fancy self-healing stuff they got going in the labs.)

The education of others is not my reason for being here. I'm here for some community. This is the only forum that I participate in.
Mocking people who come here with innocent misunderstandings of science, just to score points with your community buddies, is not really my idea of community building.

Granted, some posters, who prove to be trolls and troublemakers, deserve some mockery. But, you should not start out of the gate assuming everyone with an innocently naïve question regarding science is going to be one.

Your question disqualifies you from the long answer...
I disagree with this tactic. If you don't want to respond to someone, then don't respond. Telling them they don't deserve a response is counter-productive.

The question was a bait... I chose not to bite.
First of all, how do you know?

Second of all, even if it was: Providing a good, solid answer could "ping" him if he reads it. Sometimes it happens: If you "ping" people the right way, they could be inspired to rethink aspects of their beliefs. (I do not claim to be so great at pinging people, myself, yet. Though, I am trying to improve my skills.)

Third of all: Lurkers could visit the page, and learn something from your posts, even if the original poster does not. Leaving questions unanswered, or rudely answered, might give the mistaken impression, to some, that it can not be answered.

You can apply Darwin's theories to a system without that system being subjected to it...
Er, wha?

Perhaps that needs to be rephrased? How is that different from saying "You can apply gravity to a system, without that system being subjected to it"?

If aspects of evolutionary theory (even if it is not specifically genes) could explain the development of airplanes, then how are airplanes not subjected to evolution?

Celibate monasteries...
They, (almost like worker ants), help provide services to other humans, that ultimately aid in their survival, without placing the burden of having too many newborns to handle, in the society.

Surely, this is not too difficult for a bright, enthusiastic fellow, like you, to comprehend?
 
Perhaps that needs to be rephrased? How is that different from saying "You can apply gravity to a system, without that system being subjected to it"?

You can use fluid dynamics to better understand a crowd exiting a building but that doesn't mean the crowd will always act like a fluid.

If aspects of evolutionary theory (even if it is not specifically genes) could explain the development of airplanes, then how are airplanes not subjected to evolution?

They aren't. The fact that humans developed a tool to improve design, based on the principles of evolution, doesn't mean that the planes are subjected to evolution.

They, (almost like worker ants), help provide services to other humans, that ultimately aid in their survival, without placing the burden of having too many newborns to handle, in the society.

Not necessarily. Some monasteries place themselves in quasi-total isolation.

Surely, this is not too difficult for a bright, enthusiastic fellow, like you, to comprehend?

Explain me the soviet revolution, the vietnam war and the fall of berlin wall using evolution.

The point that I'm trying to make is, even if there are paralels between some social phenomena and evolution, you can't apply the darwinian theories to human societies. From the moment that you try to do that, you will have to explain things like class, gender, art, politics and religion in the framework of evolution.

Of course you can say that everything evolves, but when you have an intellect behind that evolution, things change.
 
Please explain how these things aid in survival and reproduction: poetry, fine art, music, humour, philosophy, haute couture, chess, sculpture, formula 1 racing, the study of Sanskrit, Egyptology, astronomy, sub-atomic particle colliders, Lacrosse, darts, internet forums for 'skeptics' ..... well I could go on all night, but you get the picture. Darwinism would need to be able to explain ALL of these. I doubt whether a convincing case could be made for even a couple of them.

All of them can be explained by the evolution of one trait in the human animal...curosity. The tendency of a human to become very restless in the absense of outside simuli.

My dog never seems to miss the ability to read a book, listen to music, laugh at a joke, look through my telescope, post to a forum, etc. He's a pretty smart dog but he can sit in the back yard for a couple of hours and just watch the birds, the sky, and things blowing across the grass without every moving a muscle. Now maybe he's just a really Zen schnauzer, but I think not.

People, on the other hand, have to have stimulus, unless there is something very wrong with the way their brains work. Some of us have to read Clarke (RIP), some of us listen to Radiohead, and some of us watch Dancing with the Stars, but humans get bored. Therefore, some of us get pleasure out of creating the things that keep the rest of us from getting bored.

We make music because we evolved the ability to discern pitches better than most species so we could develop language. Some gay (or gal) back in the days of prehistory found out that he or she could make the rest of the tribe pay attention if they tossed a little soul in with the recitation of a tall tale. And many be even got a lucky a little more often than otherwise and passed on some boogie genes. But, even if it didn't get the singer some extra nookie, the ability to do so evolved because people get bored with the same old same old. I'm not saying this is the way it happened, but I am saying it could have evolved like that.
 
Have you tried battery acid ?? :D Works for me!
Not exactly, but very close. . .


<----- I use kerosene in the mouth for this


Actually, I had a health scare not so long ago, and I have quit doing that and regular fire eating (where I used gasoline). Now it's just safe stuff like torch juggling, chainsaw juggling, sharp machetes, and so on.

FWIW, on the topic: I've already had a vasectomy, so I've removed these self-destructive alleles from the gene pool.
 
Please explain how these things aid in survival and reproduction: poetry, fine art, music, humour, philosophy, haute couture, chess, sculpture, formula 1 racing, the study of Sanskrit, Egyptology, astronomy, sub-atomic particle colliders, Lacrosse, darts, internet forums for 'skeptics' ..... well I could go on all night, but you get the picture. Darwinism would need to be able to explain ALL of these. I doubt whether a convincing case could be made for even a couple of them.
Asked and answered, but I'll try again.

While some of these things may have direct repercussions on reproductive success (especially in terms, I think of sexual selection, which is one special form of natural selection), it's not necessary.

As someone has pointed out, intelligence wasn't adaptive because a single smart human can necessarily outwit well-armed predators and take down swift running prey. At least specific aspects of intelligence are important to living in human societies--face recognition, language, pattern recognition in general, ability to infer intent, etc. The selective advantage is living successfully in the group. Many of these other pursuits can be seen as simply side-effects or emergent properties of the intelligence that was selected for due to the advantages of living in a group.

Similarly, an elephant's trunk was advantageous for a number of reasons, but a side effect is that it can carry logs around for human masters. You wouldn't claim that that trait was selected for because of its subsequent utility to humans.
 

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