In this rightly called classic book, Richard Dawkins unveils nothing less than the
Secret of life, the principle that encompasses all forms of living things, human, animal, plant, bacterial and even, if any, extraterrestrial. It is a principle that explains why we exist and why we are as we are. That principle is Darwinism.
Darwinism is a cumulative process based on step-by-step transformations (mutations) which arrive by chance. But, the cumulative selections (survivals) of the mutations are not random and are responsible for the existence of life's complex design.
The process (the `watchmaker') is blind. It has no long-term goal, no purpose. The selections are always short-term. But, it is the evolutionary change over the immensities of time which produced what we see around us.
The basic factor in cumulative selection is the property of self-replication. Mutations are `errors' in replication, which can become dominant because they produce fitter specimens (mutants).
All cells of living bodies contain genes (genetic material). But the selection is made on bodies, not genes.
The stuff of genes is DNA (a chain composed by 4 organic molecules). DNA itself is not durable, but its patterns are. Chromosomes, long strands of genes, are passed down generation after generation.
Richard Dawkins also tackles passionately other important aspects of Darwinism.
In the ongoing dispute between `gradualness' and `punctuationism' (sudden evolutionary bursts, like the swelling of the human skull), he cleverly cites J.B.S. Haldane: `something like the transition from amoeba to man goes on in every mother's womb in a mere nine months'.
Natural selection is not only destructive (survival of the fittest). It can also be constructive through gene cooperation, for instance in the `tracking' of a changing environment.
Other items are macromutation, the problem of speciation, sexual and asexual reproduction, sexual attraction and selection (`living and the struggle for survival are only means for one end: reproduction'), embryology, and the reasons why Darwinism is still not universally accepted and even attacked (for religious, ideological or political purposes).
There is, however, one crucial point that the author couldn't solve (for the moment) and for which he can only give some hints: how did the process eventually start on earth?
A convincing try was made by the Dutch scientist S.T. Bok in his book `De oorsprong van het leven' (The origin of life'. Unfortunately, his book has never been translated.
This book is a must read for all those interested in life on earth, because `Darwinism is the bedrock of all human disciplines, for all human works are products of the brain.'
And, as another great Darwinist, G.C. Williams, has said more provocatively: `natural selection, albeit stupid, is a story of unending arms races, slaughter and suffering. It is a law of nature and its immorality has to be accepted and, at least, to be thought about. `
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