By Graham Bell
...readers will count on and locate erudition, breadth, strange range of examples and sturdy writing in most up-to-date works...this ebook is explicity approximately choice. What makes this ebook helpful is its singleness of function toegether with the nice breadth of insurance of the selected topic. - Nature, Vol. 384, Dec., 1996; i like to recommend the e-book to somebody drawn to nearly any element of common choice and its value in evolution. - technology, August 1997
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Extra resources for Selection: The Mechanism of Evolution
Sample text
Continues) Self-Replicating Algorithms in Computers 31 (Continued) ..... ,f---l I This is the parasitic algorithm that often appears in evolving populations. It is produced by a point mutation in the low-order bit of instruction 42 ofthe ancestor, NOP_0 to NOP_1. This changes the template for the copy procedure from 1100 to 1110, which is now taken to mark the hind end of the individual. The parasite thus lacks a copy procedure of its own, and cannot replicate in pure culture. If it is dose enough to the copy procedure of a host, however, it can locate, read, and execute it.
All of them behave in much the same way, of course, being able to replicate fairly efficiently in culture tubes: it is the genetic basis of this adaptation that varies so widely. 20 Simple Selection A population may fail to become perfectly adapted because superior variants are poorly connected. The 550-nucleotide RNAs evolving by simplification from intact virus do not continue to evolve into the 100- or 200-nucleotide RNAs evolving from simpler predecessors, or at least do not do so in the short term, despite the fact that the shorter molecules have higher rates of replication.
With this introduction. the figure represents the basic Tierran self-replicator with which the real CPU is inoculated. (Continues) Self-Replicating Algorithms in Computers 31 (Continued) ..... ,f---l I This is the parasitic algorithm that often appears in evolving populations. It is produced by a point mutation in the low-order bit of instruction 42 ofthe ancestor, NOP_0 to NOP_1. This changes the template for the copy procedure from 1100 to 1110, which is now taken to mark the hind end of the individual.