Examples of Natural Selection in Animal Species | Sciencing

Natural selection can act on any heritable phenotypic trait, and selective pressure can be produced by any aspect of the environment, including sexual selection and competition with members of the same or other species. However, this does not imply that natural selection is always directional and results in adaptive evolution; natural selection often results in the maintenance of the status quo by eliminating less fit variants.

Natural selection is a very efficient, predictable mechanism of evolution, illustrating:

CORRECTION: This fallacious argument is based on the idea that evolution and religion are fundamentally the same since they are both "belief systems." This idea is simply incorrect. Belief in religious ideas is based on faith, and religion deals with topics beyond the realm of the natural world. Acceptance of scientific ideas (like evolution) is based on evidence from the natural world, and science is limited to studying the phenomena and processes of the natural world. Supreme Court and other Federal court decisions clearly differentiate science from religion and do not permit the advocacy of religious doctrine in science (or other public school) classes. Other decisions specifically uphold a school district's right to require the teaching of evolution. For additional information on , visit the NCSE website. To , visit the Understanding Science website.


10 Atrocities Of Natural Selection - Listverse

See a synopsis of how Darwin arrived at the natural selection hypothesis.

CORRECTION: Natural selection leads to the adaptation of species over time, but the process does not involve effort, trying, or wanting. Natural selection naturally results from genetic variation in a population and the fact that some of those variants may be able to leave more offspring in the next generation than other variants. That genetic variation is generated by random mutation — a process that is unaffected by what organisms in the population want or what they are "trying" to do. Either an individual has genes that are good enough to survive and reproduce, or it does not; it can't get the right genes by "trying." For example bacteria do not evolve resistance to our antibiotics because they "try" so hard. Instead, resistance evolves because random mutation happens to generate some individuals that are better able to survive the antibiotic, and these individuals can reproduce more than other, leaving behind more resistant bacteria. To , visit our article on this topic. To , visit our article on DNA and mutations.


ActionBioscience - promoting bioscience literacy

Natural Selection and the Origin of "Irreducibly Complex Structures"
Behe defines irreducible complexity (1998, p. 178) as follows: "An irreducibly complex system is one that requires several closely matched parts in order to function and where removal of one of the components effectively causes the system to cease functioning." His mousetrap example illustrates the point: "The function of the mouse trap requires all the pieces: you cannot catch a few mice with just a platform, add a spring and catch a few more mice, add a holding bar and catch a few more. All the components have to be in place before any mice are caught." Concerning the significance of the principle of irreducible complexity for natural selection, Behe explains (p. 179):

The Origin of Species: Chapter 4 - TalkOrigins Archive

For a detailed anatomical and developmental study of the genesis of the eye, specifying Darwin’s and Dawkins’ fallacies of natural selection and gradualistic evolution under full quotation of the relevant passages, see Lönnig, 1989. Also, several important points (as the improbability to derive a eye from a one) have been discussed by Denton (1998).

Genetic Algorithms and Evolutionary Computation

Natural Selection and the Origin of New Genes
The observations summarized in the law of recurrent variation directly lead to the question of the origins of new genes. The probability of obtaining an entirely new functional DNA sequence (necessary, for example, for the origin of the more than five thousand extant different gene families of today’s living organisms) due to gene duplications with subsequent nucleotide substitutions by point and other mutations has been calculated by several authors to be less than 1 in1050, even granting billions of years for natural selection working on random mutations (ReMine, 1993; Kunze et al., 1997). The result is, simply put, that the probability is so low that no reasonable person would expect to obtain a target or goal in any other area of life by such small chances. Due to the factual absence of completely new functional DNA sequences in mutagenesis experiments, as well as the low likelihood referenced above, the origin of new genes and gene families cannot be explained by natural selection. Additionally, the necessity of genetic engineering for organism transformation simultaneously exemplifies the fact that induced mutations in the host organism cannot substitute for the task. This is not only true for slow breeding organisms, but also for the fastest; for instance, bacteria like where thousands of generations with trillions of individuals per generation can be cultivated in the relatively short time of a few years (3,500 generations in 1 year; 1 gram of cells contains about 1013 individuals).