Difference between revisions of "Evolution"

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'''Evolution by means of Natural Selection''' is a process in which, over many generations a species of creatures gradually changes into others. The theory was created by British naturalist Charles Robert Darwin and was published in his book, ''On the Origin of Species''. Evolution by means of natural selection works as individuals with favorable traits towards survival in a particular environment (both in terms of Climate, competition from other species, predators, prey and changes in said factors) are more likely to reproduce and spread their genes (and traits) to other individuals in the next generation while those without said traits are less likely to reproduce, gradually building up traits and changing the individuals of the population of said species over thousands to millions of years. Natural selection is next to universally agreed upon by the Scientific community and is backed up by mountains of mutually supporting evidence. Nevertheless, outside the Scientific Community, there are large numbers of Religious fundamentalists who dismiss evolution in favour of Bronze-Age Creation mythology.  These people all too often find their way to SD.net to denounce evolution in the name of God, using arguments which have been defeated decades beforehand.
'''Evolution''' is the process by which a given system gradually changes. When applied to [[biology]], the term most commonly refers to the '''Theory of Evolution''', the scientific [[theory]] which describes the process by which species adapt over time, as observed in the [[fossil]] record and laboratory testing. Originally proposed by the British naturalist [[Charles Darwin]] in his work ''On the Origin of Species'', it has since been refined and expanded by generations of biologists.


[[Category:Evolution vs Creationism debate]]
==Process==
 
The basic principle of evolution is that a beneficial trait, emerging through random [[mutation]] or recombination in a given species' [[DNA]],  will propagate itself into following generations, while undesirable traits are not passed on. This is made possible by the fact that these beneficial traits increase the chance that their carrying creature survives to adulthood to procreate and pass on said trait. A common misconception is that this leads to survival of the ''fittest'', ie those creatures who are ''physically superior''; in practice, it leads to the survival of those creatures who are ''most suited to their environment'', regardless of physical prowess.
 
When populations are isolated through geographical or climate factors, a new species may arise as more unique traits are passed on to following generations. A prominent example - and one that partially  inspired the original theory - was the development of subspecies among the finches of the Galapagos Islands, where populations of birds had evolved different beak structures to better gather specific types of food.
 
==Current status and controversy==
 
Within the scientific community, evolution is virtually universally accepted as the means by which the current diversity of species on Earth came into being. There are, however, small groups which still resist the acceptance of the theory, usually on the grounds that it conflicts with their religious account of the creation of Earth. These groups have marginal influence within the scientific community; instead, they often resort to presenting their views directly to laymen, preferably by introducing their own views (see [[Intelligent Design]]) directly through the school system. These efforts have had some success, particularly in the [[United States of America|United States]].
 
Both [[SDN]]'s community and Mike Wong's [http://www.creationtheory.org/ CreationTheory] website have applied themselves to debate the merits of evolution and the scientific errors committed by its detractors.
 
==In Science Fiction==
Many [[science fiction]] franchises, [[Star Trek]] in particular, portray an extremely distorted picture of evolution theory. The phrase "evolutionary level" is often used, implying some forms of life are inherently superior to others. A particular form of life may even be described as the "pinnacle of evolution", as if life in this form is incapable of further evolutionary change.
 
Aliens and humans often undergo a metamorphosis into some kind of different creature, with the event described as an "evolutionary" change.  Real evolution occurs from one generation to the next, as different traits are selected by natural selection in different proportions in subsequent generations.  Metamorphosis is not evolution.
 
If the misunderstanding doesn't involve sudden transformations, it probably subscribes to the notion that [[humanoid]]s are some sort of goal of evolution, hence all advanced species are humanoid, and everything else is evolving toward a humanoid form.  Real evolution does not "advance" toward a particular goal, it simply adds new variations to the mix and then filters out forms that don't reproduce successfully in their environments.
 
[[Category:Creationism vs Science]]
[[Category:Science]]

Latest revision as of 15:16, 25 September 2013

Evolution is the process by which a given system gradually changes. When applied to biology, the term most commonly refers to the Theory of Evolution, the scientific theory which describes the process by which species adapt over time, as observed in the fossil record and laboratory testing. Originally proposed by the British naturalist Charles Darwin in his work On the Origin of Species, it has since been refined and expanded by generations of biologists.

Process

The basic principle of evolution is that a beneficial trait, emerging through random mutation or recombination in a given species' DNA, will propagate itself into following generations, while undesirable traits are not passed on. This is made possible by the fact that these beneficial traits increase the chance that their carrying creature survives to adulthood to procreate and pass on said trait. A common misconception is that this leads to survival of the fittest, ie those creatures who are physically superior; in practice, it leads to the survival of those creatures who are most suited to their environment, regardless of physical prowess.

When populations are isolated through geographical or climate factors, a new species may arise as more unique traits are passed on to following generations. A prominent example - and one that partially inspired the original theory - was the development of subspecies among the finches of the Galapagos Islands, where populations of birds had evolved different beak structures to better gather specific types of food.

Current status and controversy

Within the scientific community, evolution is virtually universally accepted as the means by which the current diversity of species on Earth came into being. There are, however, small groups which still resist the acceptance of the theory, usually on the grounds that it conflicts with their religious account of the creation of Earth. These groups have marginal influence within the scientific community; instead, they often resort to presenting their views directly to laymen, preferably by introducing their own views (see Intelligent Design) directly through the school system. These efforts have had some success, particularly in the United States.

Both SDN's community and Mike Wong's CreationTheory website have applied themselves to debate the merits of evolution and the scientific errors committed by its detractors.

In Science Fiction

Many science fiction franchises, Star Trek in particular, portray an extremely distorted picture of evolution theory. The phrase "evolutionary level" is often used, implying some forms of life are inherently superior to others. A particular form of life may even be described as the "pinnacle of evolution", as if life in this form is incapable of further evolutionary change.

Aliens and humans often undergo a metamorphosis into some kind of different creature, with the event described as an "evolutionary" change. Real evolution occurs from one generation to the next, as different traits are selected by natural selection in different proportions in subsequent generations. Metamorphosis is not evolution.

If the misunderstanding doesn't involve sudden transformations, it probably subscribes to the notion that humanoids are some sort of goal of evolution, hence all advanced species are humanoid, and everything else is evolving toward a humanoid form. Real evolution does not "advance" toward a particular goal, it simply adds new variations to the mix and then filters out forms that don't reproduce successfully in their environments.