5. Natural Selection
An offspring of a plant or animal has characteristics that vary, often in subtle ways, from its “parents.” Because of the environment, genetics, and chance circumstances, some of these offspring will reproduce more than others. So a species with certain characteristics will tend, on average, to have more “children.” In this sense, nature “selects” genetic characteristics suited to an environment—and, more importantly, eliminates unsuitable genetic variations. Therefore, an organism’s gene pool is constantly decreasing. This is called natural selection.a
Notice, natural selection cannot produce new genes; it only selects among preexisting characteristics. As the word “selection” implies, variations are reduced, not increased.b
For example, many mistakenly believe that insect or bacterial resistances evolved in response to pesticides and antibiotics. Instead,
• a previously lost capability was re-established, making it appear something evolved,c
• a mutation reduced the binding ability, regulatory function, or transport capacity of certain proteins,
• a damaging bacterial mutation or variation reduced the antibiotic’s effectiveness even more,d or
• a few resistant insects and bacteria were already present when the pesticides and antibiotics were first applied. When the vulnerable insects and bacteria were killed, resistant varieties had less competition and, therefore, proliferated.e
While natural selection occurred, nothing evolved and, in fact, some biological diversity was lost.
The variations Darwin observed among finches on different Galapagos islands is another example of natural selection producing micro- (not macro-) evolution. While natural selection sometimes explains the survival of the fittest, it does not explain the origin of the fittest.f Today, some people think that because natural selection occurs, evolution must be correct. Actually, natural selection prevents major evolutionary changes.g
References:
a. In 1835 and again in 1837, Edward Blyth, a creationist, published an explanation of natural selection. Later, Charles Darwin adopted it as the foundation for his theory, evolution by natural selection. Darwin failed to credit Blyth for his important insight. [See evolutionist Loren C. Eiseley, Darwin and the Mysterious Mr. X (New York: E. P. Dutton, 1979), pp. 45–80.]
Darwin also largely ignored Alfred Russel Wallace, who had independently proposed the theory that is usually credited solely to Darwin. In 1855, Wallace published the theory of evolution in a brief note in the Annals and Magazine of Natural History, a note that Darwin read. Again, on 9 March 1858, Wallace explained the theory in a letter to Darwin, 20 months before Darwin finally published his more detailed theory of evolution.
Edward Blyth also showed why natural selection would limit an organism’s characteristics to only slight deviations from those of all its ancestors. Twenty-four years later, Darwin tried to refute Blyth’s explanation in a chapter in The Origin of Species by Means of Natural Selection (24 November 1859).
Darwin felt that, with enough time, gradual changes could accumulate. Charles Lyell’s writings (1830) had persuaded Darwin that the earth was at least hundreds of thousands of years old. James Hutton’s writings (1788) had convinced Lyell that the earth was extremely old. Hutton felt that certain geological formations supported an old earth. Those geological formations are explained, not by time, but by a global flood. [See pages 100–256.]
“Darwin was confronted by a genuinely unusual problem. The mechanism, natural selection, by which he hoped to prove the reality of evolution, had been written about most intelligently by a nonevolutionist [Edward Blyth]. Geology, the time world which it was necessary to attach to natural selection in order to produce [hopefully] the mechanism of organic change, had been beautifully written upon by a man [Charles Lyell] who had publicly repudiated the evolutionary position.” Eiseley, p. 76.
Charles Darwin also plagiarized in other instances. [See Jerry Bergman, “Did Darwin Plagiarize His Evolution Theory?” Technical Journal, Vol. 16, No. 3, 2002, pp. 58–63.]
b. “[Natural selection] may have a stabilizing effect, but it does not promote speciation. It is not a creative force as many people have suggested.” Daniel Brooks, as quoted by Roger Lewin, “A Downward Slope to Greater Diversity,” Science, Vol. 217, 24 September 1982, p. 1240.
“The essence of Darwinism lies in a single phrase: natural selection is the creative force of evolutionary change. No one denies that natural selection will play a negative role in eliminating the unfit. Darwinian theories require that it create the fit as well.” Stephen Jay Gould, “The Return of Hopeful Monsters,” Natural History, Vol. 86, June–July 1977, p. 28.
c. G. Z. Opadia-Kadima, “How the Slot Machine Led Biologists Astray,” Journal of Theoretical Biology, Vol. 124, 1987, pp. 127–135.
d. Eric Penrose, “Bacterial Resistance to Antibiotics—A Case of Un-Natural Selection,” Creation Research Society Quarterly, Vol. 35, September 1998, pp. 76–83.
e. Well-preserved bodies of members of the Franklin expedition, frozen in the Canadian Arctic in 1845, contain bacteria resistant to antibiotics. Because the first antibiotics were developed in the early 1940s, these resistant bacteria could not have evolved in response to antibiotics. Contamination has been eliminated as a possibility. [See Rick McGuire, “Eerie: Human Arctic Fossils Yield Resistant Bacteria,” Medical Tribune, 29 December 1988, p. 1.]
“The genetic variants required for resistance to the most diverse kinds of pesticides were apparently present in every one of the populations exposed to these man-made compounds.” Francisco J. Ayala, “The Mechanisms of Evolution,” Scientific American, Vol. 239, September 1978, p. 65.
f. “Darwin complained his critics did not understand him, but he did not seem to realize that almost everybody, friends, supporters and critics, agreed on one point, his natural selection cannot account for the origin of the variations, only for their possible survival. And the reasons for rejecting Darwin’s proposal were many, but first of all that many innovations cannot possibly come into existence through accumulation of many small steps, and even if they can, natural selection cannot accomplish it, because incipient and intermediate stages are not advantageous.” Søren Løvtrup, Darwinism: The Refutation of a Myth (New York: Croom Helm, 1987), pp. 274–275.
“It was a shock to the people of the 19th century when they discovered, from observations science had made, that many features of the biological world could be ascribed to the elegant principle of natural selection. It is a shock to us in the twentieth century to discover, from observations science has made, that the fundamental mechanisms of life cannot be ascribed to natural selection, and therefore were designed. But we must deal with our shock as best we can and go on. The theory of undirected evolution is already dead, but the work of science continues.” Michael J. Behe, “Molecular Machines,” Cosmic Pursuit, Spring 1998, p. 35.
g. In 1980, the “Macroevolution Conference” was held in Chicago. Roger Lewin, writing for Science, described it as a “turning point in the history of evolutionary theory.” He went on to say:
The central question of the Chicago conference was whether the mechanisms underlying microevolution can be extrapolated to explain the phenomena of macroevolution. At the risk of doing violence to the positions of some of the people at the meeting, the answer can be given as a clear, No. Roger Lewin, “Evolution Theory under Fire,” Science, Vol. 210, 21 November 1980, p. 883.
“In a generous admission Francisco Ayala, a major figure in propounding the Modern Synthesis [neo-Darwinism] in the United States, said ‘We would not have predicted stasis [the stability of species over time] from population genetics, but I am now convinced from what the paleontologists say that small changes do not accumulate.’ ” Ibid., p. 884.
As stated earlier, micro + time ≠ macro.
“One could argue at this point that such ‘minor’ changes [microevolution], extrapolated over millions of years, could result in macroevolutionary change. But the observational evidence will not support this argument ... [examples given] Thus, the changes observed in the laboratory are not analogous to the sort of changes needed for macroevolution. Those who argue from microevolution to macroevolution may be guilty, then, of employing a false analogy—especially when one considers that microevolution may be a force of stasis [stability], not transformation. ... For those who must describe the history of life as a purely natural phenomenon, the winnowing action of natural selection is truly a difficult problem to overcome. For scientists who are content to describe accurately those processes and phenomena which occur in nature (in particular, stasis), natural selection acts to prevent major evolutionary change.” Michael Thomas, “Stasis Considered,” Origins Research, Vol. 12, Fall/Winter 1989, p. 11.
