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IV. Quantitative and Evolutionary Genetics
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21. Evolution and Speciation
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Evolution and Speciation
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record, embryology, comparative anatomy, geographic distributions, etc.) is so overwhelming that the general nature of evolution is not in doubt. We can clearly trace its path, although we cannot make exact predictions for its future. From a philosophical point of view, neo-Darwinism is the general paradigm (broad concept) de ning normal biology. Every scienti c endeavor works under the umbrella of a paradigm. When enough inconsistencies appear, a new paradigm is sought to replace the old in what Thomas Kuhn called a scienti c revolution. In physics, relativity overthrew Newtonian principles. In biology, Darwinism overthrew the concept of a recent, biblically described origin of animals and plants. Darwinism became the paradigm because it explained many things in a consistent fashion that a recent origin of all forms of life could not. NeoDarwinism will remain the current paradigm unless it is overthrown by a better theory that explains previous inconsistencies. To date, no major
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inconsistencies suggest that neoDarwinism is not correct. In his article, Bethell went on to try to refute neo-Darwinism using the following argument: Survival of the ttest can be rede ned to mean that some organisms have more offspring than others. Thus, natural selection cannot be a creative force because the only thing it works on is organisms alive now, some having more offspring than others. How, asks Bethell, can this possibly give us tigers and horses from ancestors that did not look like tigers and horses The answer is that mutation produces variants in the population. The organism best able to compete will leave the most offspring. With an array of different genotypes in a population, natural selection determines which genotypes will increase in future generations. Traits that give the bearer an advantage increase in the population, and evolution takes place. Natural selection was the force behind the evolution from the small Eocene horse to the modern Equus.
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Misinterpretation of mutation is the basis for other attacks on Darwinism. For example, Darwinian evolution has been attacked as not feasible, since most mutations are deleterious. How, the argument goes, can evolution proceed by a combination of deleterious events The answer is that although most mutations are deleterious, some are not. This is especially true in changing environments; yesterday s deleterious mutant may be today s favored mutant. The most recent attacks on Darwinism have been launched by creationists, who have attempted to pass laws in many states requiring schools to teach the biblical version of creation as an alternative to Darwinism. The courts have rejected this position because creationism is not a scientific theory. It does not follow the rules of the scientific method wherein empirical evidence can refute it.
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Unfortunately, the de nition of species on the basis of interbreeding cannot be used in many places, mostly due to the technical problems of applying it. Taxonomists and paleontologists, who often use nonliving specimens (preserved or fossilized), use the morphological species concept as a working de nition. Under this concept, two organisms are classi ed as belonging to the same species if they are morphologically similar. They are classi ed as belonging to two different species if they are as different as two organisms belonging to two recognized species. Other problems arise for taxonomists since speciation is a dynamic process. For example, isolated subgroups of a population may be in various stages of becoming new species; the rate of successful interbreeding among individuals from these subgroups may range from 0 to 100%. How should the in-betweens be classi ed There is no correct answer. It depends on the circumstances. Still other problems make it necessary to turn to the morphological species concept. Haploid and asexual
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species are hard to classify. Also, two organisms that will not interbreed in nature may do so in a laboratory setting. Thus, the interbreeding test carried out in the laboratory (as is done frequently) is not necessarily an adequate criterion for speciation. Other problems arise in classifying groups that are geographically isolated from each other, such as populations on islands.These individuals are physically isolated, but in many cases they can interbreed freely when brought together with their mainland counterparts. So, although there is a good theoretical de nition of a species (potentially interbreeding individuals), more often than not it is necessary for biologists to apply the morphological species concept to determine whether two populations belong to the same species. In some cases, no decision can be made about the species status of a population. It is clear that a population has evolved, but it is not clear whether it has evolved enough to be called a new species. However, this is more of a problem for taxonomists and evolutionary biologists than for the organisms themselves.
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