28 replies to this topic

[Harlot]

Who made the chicken pop up out of no where? Was this God or was the chicken a result of evolution? Did the chicken didn't developmental stages or did the sun come up on day and there the chicken was?

[Bikerman]

Harlot, on 24 September 2010 - 04:35 AM, said:

Who made the chicken pop up out of no where? Was this God or was the chicken a result of evolution? Did the chicken didn't developmental stages or did the sun come up on day and there the chicken was?

Well, first come the dinosaurs. Then comes a particular dinosaur called Archaeopteryx. Then this evolves and one generation is getting close to what we call a chicken. Where you draw the line is moot...

[truefusion]

Bikerman, on 23 September 2010 - 05:50 PM, said:

Let us take an example.
A driver is proceeding down a road. An ambulance happens to speed past them and causes him to swerve. At that moment a person jumps into the road and forces him to violently steer right which means he swerves into a bus queue and happens to kill the brother of the person in the ambulance. Coincidence? Yes. There is no causal link between the elements, yet the person dies and there is a coincidence.

I do not understand what 'excuse' means in this context. It seems to me to be an entirely inappropriate word for 'reason'. As I said earlier, your problem is that evolution does not require coincidence so the thesis is flawed from the start.

The only possible coincidence is caused by the emphasis placed on who is in the ambulence and who died at the bus queue; however, this emphasis is placed for no apparent reason, therefore meaningless, non-sequitur. Nevertheless, it is possible that the reason why the brother was at the bus queue was because he lacked transportation to the hospital and that he was not allowed to ride in the ambulence. In other words, the incident that the one in the ambulence was involved in happened near the bus queue.

Bikerman, on 23 September 2010 - 05:50 PM, said:

You have completely misunderstood (and misrepresented) Darwin. Chapter 4 deals with the environment in detail.


Do you want me to continue? I can quote as much as needed.

Well, then, you'll have to quote more, 'cause what you have quoted does not show that the environment is considered for the species' evolution. Rather, the quote you provided talks about the land undergoing climate change, not the creatures undergoing any change, for there is no mention of this climate change causing the animals to evolve. In fact, it even mentions, "independently of the change of climate itself." Anything further mentioned does not provide any information on environmental changes causing biological changes in the inhabitants.

Bikerman, on 23 September 2010 - 05:50 PM, said:

Why do you think that evolutionary theory rests on Darwin in any case? Do you not understand the work on genetics and the evolutionary synthesis that has been formulated since then? Trying to pick holes in Darwin's original formulation is to ignore the work since, and is therefore disingenuous. If you want to talk about evolution then bring it on.

If we are to use terms like "natural selection," then we must use authoritative sources that explicitly define what they mean. In this case, we have Darwin. If you have other sources that explicitly define "natural selection" in accordance to what we know today, where "natural selection" is not simply mentioned as if it assumes that we should already know what it means, then you should post these sources. Until then, there is no other reason to assume anything further than what Darwin himself wrote.

[Bikerman]

truefusion, on 27 September 2010 - 08:43 AM, said:

The only possible coincidence is caused by the emphasis placed on who is in the ambulence and who died at the bus queue; however, this emphasis is placed for no apparent reason, therefore meaningless, non-sequitur. Nevertheless, it is possible that the reason why the brother was at the bus queue was because he lacked transportation to the hospital and that he was not allowed to ride in the ambulence. In other words, the incident that the one in the ambulence was involved in happened near the bus queue.

Co-incidence is simply two or more unrelated happenings. There are several unrelated happenings in the scenario which result in a person being killed.

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Well, then, you'll have to quote more, 'cause what you have quoted does not show that the environment is considered for the species' evolution. Rather, the quote you provided talks about the land undergoing climate change, not the creatures undergoing any change, for there is no mention of this climate change causing the animals to evolve. In fact, it even mentions, "independently of the change of climate itself." Anything further mentioned does not provide any information on environmental changes causing biological changes in the inhabitants.

But this is sheer nonsense, as well as being untrue. The last sentence in my quoted passage clearly refers to EXACTLY environmental change producing biological change.
"In such cases, slight modifications, which in any way favoured the individuals of any species, by better adapting them to their altered conditions, would tend to be preserved; and natural selection would have free scope for the work of improvement."
It couldn't be more explicit.

The whole thesis of 'On the origin' is concerned with environment affecting phenotype. Chapter 3 begins with an introduction to this idea:

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BEFORE entering on the subject of this chapter, I must make a few preliminary remarks, to show how the struggle for existence bears on Natural Selection. It has been seen in the last chapter that amongst organic beings in a state of nature there is some individual variability:indeed I am not aware that this has ever been disputed. It is immaterial for us whether a multitude of doubtful forms be called species or sub-species or varieties; what rank, for instance, the two or three hundred doubtful forms of British plants are entitled to hold, if the existence of any well-marked varieties be admitted. But the mere existence of individual variability and of some few well-marked varieties, though necessary as the foundation for the work, helps us but little in understanding how species arise in nature. How have all those exquisite adaptations of one part of the organisation to another part, and to the conditions of life,and of one organic being to another being, been perfected? We see these beautiful coadaptations most plainly in the woodpecker and the mistletoe; and only a little less plainly in the humblest parasite which clings to the hairs of a quadruped or feathers of a bird; in the structure of the beetle which dives through the water; in the plumed seed which is wafted bythe gentlest breeze; in short, we see beautiful adaptations everywhere and in every part of the organic world.

The word 'adaption' means exactly change in relation to the environment.

He hammers this home explicitly in the following paragraphs:

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We have good reason to believe, as shown in the first chapter, that changes in the conditions of life give a tendency to increased variability; and in the foregoing cases the conditions have changed, and this would manifestly be favourable to natural selection, by affording a better chance of the occurrence of profitable variations.

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Again, it may be asked, how is it that varieties, which I have called incipient species, become ultimately converted into good and distinct species which in most cases obviously differ from each other far more than do the varieties of the same species? How do those groups of species, which constitute what are called distinct genera, and which differ from each other more than do the species of the same genus, arise? All these results, as we shall more fully see in the next chapter, follow from the struggle for life. Owing to this struggle, variations, however slight and from whatever cause proceeding, if they be in any degree profitable to the individuals of a species, in their infinitely complex relations to other organic beings and to their physical conditions of life, will tend to the preservation of such individuals, and will generally be inherited by the offspring. The offspring, also, will thus have a better chance of surviving, for, of the many individuals of any species which are periodically born, but a small number can survive. I have called this principle, by which each slight variation, if useful, is preserved, by the term Natural Selection, in order to mark its relation to man's power of selection. But the expression often used by Mr. Herbert Spencer of the Survival of the Fittest is more accurate, and is sometimes equally convenient. We have seen that man by selection can certainly produce great results, and can adapt organic beings to his own uses, through the accumulation of slight but useful variations, given to him by the hand of Nature.

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If we are to use terms like "natural selection," then we must use authoritative sources that explicitly define what they mean. In this case, we have Darwin. If you have other sources that explicitly define "natural selection" in accordance to what we know today, where "natural selection" is not simply mentioned as if it assumes that we should already know what it means, then you should post these sources. Until then, there is no other reason to assume anything further than what Darwin himself wrote.

You want sources? Nothing easier:
http://www.sciencema...t/320/5883/1629
http://bjps.oxfordjo.../57/4/627.short
http://genomebiology...ght-20050118-01
http://iai.asm.org/c.../full/72/5/2457
http://www.mdpi.com/1999-4915/1/3/362/

I can supply thousands if you have the time to read them....

Alternatively you could use the dictionary:

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The process in nature by which, according to Darwin's theory of evolution, only the organisms best adapted to their environment tend to survive and transmit their genetic characteristics in increasing numbers to succeeding generations while those less adapted tend to be eliminated.

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(Life Sciences & Allied Applications / Biology) a process resulting in the survival of those individuals from a population of animals or plants that are best adapted to the prevailing environmental conditions. The survivors tend to produce more offspring than those less well adapted, so that the characteristics of the population change over time, thus accounting for the process of evolution

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The process by which organisms that are better suited to their environment than others produce more offspring. As a result of natural selection, the proportion of organisms in a species with characteristics that are adaptive to a given environment increases with each generation. Therefore, natural selection modifies the originally random variation of genetic traits in a species so that alleles that are beneficial for survival predominate, while alleles that are not beneficial decrease. Originally proposed by Charles Darwin, natural selection forms the basis of the process of evolution.

Edited by Bikerman, 29 September 2010 - 05:15 PM.