Andrew's Reviews > Proving Darwin: Making Biology Mathematical
Proving Darwin: Making Biology Mathematical
by Gregory Chaitin
by Gregory Chaitin
This book promised so much, and yet delivered so little. To be sure, the author has some very interesting ideas that are worth being exposed to but that does not save this book. The first problem is in delivery - almost the entire book seems to be taken verbatim from class lectures. Certain content is duplicated often enough, that the book could have been cut in half with no loss. The second issue lies in the content itself. The author claims to have developed a working toy model of Darwinian evolution. But there's one fundamental problem here - his model relies on algorithmic mutation to introduce diversity, whereas real organisms generally undergo bitwise mutation. Hence, his model allows for a much more sophisticated search of the genotype space than is allowed in nature. In the same vein, by his own admission, the model can not actually be simulated, because it relies on a fitness function that can not be guaranteed to produce a result.
Not as important, but still misleading, is that his result claims to model Darwinian evolution. This is not true, as Darwinism posits that all existing life forms came into being from nothing (or from a primordial soup, if you wish) solely through natural selection acting on genetic crossover & mutation. What his model actually demonstrates (or would, if it could be simulated) is non-Darwinian adaptation & evolution. His evolution is only capable of tiny incremental changes that can not possibly create entirely new structures - they can only rearrange existing structures.
In summary, the fundamental ideas relating biology-mathematics-creativity are very interesting, as is the goal of developing a mathematical model for evolution. However, all this is worth a 30-60 minute lecture; not this book.
Not as important, but still misleading, is that his result claims to model Darwinian evolution. This is not true, as Darwinism posits that all existing life forms came into being from nothing (or from a primordial soup, if you wish) solely through natural selection acting on genetic crossover & mutation. What his model actually demonstrates (or would, if it could be simulated) is non-Darwinian adaptation & evolution. His evolution is only capable of tiny incremental changes that can not possibly create entirely new structures - they can only rearrange existing structures.
In summary, the fundamental ideas relating biology-mathematics-creativity are very interesting, as is the goal of developing a mathematical model for evolution. However, all this is worth a 30-60 minute lecture; not this book.
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Tam
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Oct 23, 2012 10:33pm
Andrew, I agree with you that this book fails pretty spectacularly on its claims. However, one of your points is, I think, inaccurate. Chaitin explicitly developed his toy model to go beyond population genetics, which is fairly described as a theory that describes incremental shifts in gene frequencies that can't produce major novelties. Chaitin's theory, however, can produce real novelty, but only by his use of an "oracle," or, in my words, by invoking miracles to find the next step to higher fitness. So it seems to work theoretically but only in such a way that divorces it entirely from real biology. He acknowledges that his effort is just a start but I'm not at all convinced that it's much of a helpful step (though I'm still noodling, to be sure).
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