On-line version ISSN 2072-8050
Print version ISSN 0259-9422
Herv. teol. stud. vol.64 n.1 Pretoria Mar. 2008
BOEKBESPREKINGS / BOOK REVIEWS
Ayala, F J 2006 Darwin and intelligent design
Publisher: Fortress. 116 Pages. Price: Unknown
Reviewer: Prof Cornel du Toit (University of South Africa)
Ayala is the Donald Bren professor of biological sciences at the University of California and a prominent figure in the science-theology debate.
The book deals with the controversial topic of ID (Intelligent Design) in an intelligible, fascinating way. It explains ID with reference to Paleys work (ch 1), contrasting it with Darwin (ch 2): Darwins greatest accomplishment was to show that the complex organization and functioning of living beings is the result of a natural process of selection, without any need to postulate a creator or other external agent (p 19). Chapter 3 deals withevolution, explicating the fossil record and radiometric dating (measuring the residual amount of natural radioactive atoms in certain minerals). With reference to the old argument of missing links to account for evolutionary development, Ayala cites links that are constantly being found, confirming and reinforcing the existing model. Thus a recently discovered fossil (announced in April 2006), known as Tiktaalik, goes a long way towards bridging the gap between fishes and tetrapods (p 32). Continuing, he describes the Archaeopteryx (p 33), which displays a mixture of avian and reptilian traits. Thus, he confidently avers (p 41): It is now possible to assert that gaps of knowledge in the evolutionary history of living organisms no longer exist.
Ayala mentions the known fact that most species display design errors, which suggest natural selection rather than ID: [I]t is imperfect design, accomplished by natural selection, rather than intelligent design (p 34). He refers to archaic similarities manifesting mainly at embryonic level, then turns to the universal tree of life: molecular biology has made it possible to reconstruct the universal tree of life, the continuity of succession from original forms of life (ancestral to all living organisms) to every species now living on earth (p 41). In chapter 4 he gets down to hominid evolution and the development of the hominid brain and mind. Chapter 5 explains natural selection and how it differs from the ID model. Darwin defined the basic principle of natural selection as follows: This preservation of favorable variations and the rejection of injurious variations, I call Natural Selection (p 56). He explores evolution in the form of genetic change and DNA mutations (p 57-60). At the end of the long process of evolution, we have organisms each exhibiting features designed for their survival in the habitat where they happen to exist (p 64). The flaw in the ID case is that complex organs originated over a relatively short period. Another fallacy is that some species could not evolve because they were dependent on other species in the food chain. Ayala counters this as follows: But we can readily understand that the accumulation of millions of small, functionally advantageous changes could yield remarkably complex and adaptive organs, such as the eye (p 64). He elaborates on the example of the evolution of the eye (p 66-68).
Chapter 6 outlines the ideas underlying ID, citing proponents of this approach such as Dembski, Behe and Johnson. Ayala highlights the court verdict on ID in December 2005, in which judge Jones (quoted on p 77) said: ID is at bottom premised on a false dichotomy, namely that to the extent evolutionary theory is discredited, ID is confirmed . The same argument was employed by creationists in the 1980s to support creation science. Some of the logical inconsistencies of ID are analysed (p 80ff). The book concludes with a chapter on religious belief (90 ff). Ayala again cites judge Jones in support of his own view: Many of the leading proponents of ID make a bedrock assumption which is utterly false. Their presupposition is that evolutionary theory is antithetical to a belief in the existence of a supreme being and to religion in general (p 90-91). Ayala affirms the neutrality of science, then confesses: Successful as it is, and universally encompassing as its subject is, a scientific view of the world is hopelessly incomplete. Matters of value and meaning are outside its scope (p 102).
The book highlights the biases of ID, affirms the evolutionary model and developments in this regard and underscores the place and value of faith and religion.