The Blind Watchmaker and Weasel Assignment Due: Thursday 18th October Worth: 50 pts. Rationale: The Blind Watchmaker is a software program written to support Richard Dawkins book of the same title. The intent of the program is to demonstrate the ease with which complex ‘biomorphs’ can be generated by iterative application of simple rules, under the influence of (in this case) artificial selection. Obviously, it helps if you have read the relevant sections of Dawkin’s book first! The Exercise: A simplified version can be found as an applet (i.e. you can run it directly from your web-browser) at: http://www.emergentmind.com/biomorphs The Weasel applet demonstrates the same general concept - the ability of evolutionary processes to solve very complex problems - in a different way. It can be accessed at: http://www.vanallens.com/exchristian/weasel/ (requires Java) A more sophisticated implementation (doesn’t require Java) can be found at: http://evoinfo.org/weasel.html The Assignment: (a) Your assignment is very simple. Familiarize yourself with the Blind Watchmaker applet, and produce a biomorph of “animal-like appearance” (this is entirely subjective – you choice) by selecting a “parent” and breeding from it, then selecting the most animal-like offspring and repeating the procedure. How many generations did it take to reach something that you judge suitably animal-like (you have seen Dawkins’ examples)? Next, reset the applet and try direct "God-like" intervention; i.e. adjust the genes directly to see what they do. Finally, reset the applet, and proceed again by random selection. Does complexity continually increase from generation to generation? In what ways does the simulation provide a realistic approximation to organic evolution on Earth? In what ways does the simulation differ from real-World evolution? (Note: To print your biomorphs, maximize the display, and use your "Print Screen" key to save to the clipboard, then paste into an open Windows document. Mac users - you are on your own!). (b) Run the Weasel applet. Start with a short phrase or single word. How many tries does it take the applet to find the solution? Repeat the exercise with the same word or phrase. Does it take the same number of tries to find the solution? If not, repeat the exercise enough times to determine the mean and range of the number of tries. Now run the applet with progressively longer phrases. What is the relationship between length of the phrase and the mean number of tries? c) The following extract is from “The Mathematical Impossibility of Evolution” by Henry Morris (Institute for Creation Research). But let us give the evolutionist the benefit of every consideration. Assume that, at each mutational step, there is equally as much chance for it to be good as bad. Thus, the probability for the success of each mutation is assumed to be one out of two, or one-half. Elementary statistical theory shows that the probability of 200 successive mutations being successful is then (½)200, or one chance out of 1060. The number 1060, if written out, would be "one" followed by sixty "zeros." In other words, the chance that a 200- component organism could be formed by mutation and natural selection is less than one chance out of a trillion, trillion, trillion, trillion, trillion! Lest anyone think that a 200- part system is unreasonably complex, it should be noted that even a one-celled plant or animal may have millions of molecular "parts." The evolutionist might react by saying that even though any one such mutating organism might not be successful, surely some around the world would be, especially in the 10 billion years (or 1018 seconds) of assumed earth history. Therefore, let us imagine that every one of the earth's 1014 square feet of surface harbors a billion (i.e., 109) mutating systems and that each mutation requires one-half second (actually it would take far more time than this). Each system can thus go through its 200 mutations in 100 seconds and then, if it is unsuccessful, start over for a new try. In 1018 seconds, there can, therefore, be 1018/102, or 1016, trials by each mutating system. Multiplying all these numbers together, there would be a total possible number of attempts to develop a 200-component system equal to 1014 (109) (1016), or 1039 attempts. Since the probability against the success of any one of them is 1060, it is obvious that the probability that just one of these 1039 attempts might be successful is only one out of 1060/1039, or 1021. All this means that the chance that any kind of a 200-component integrated functioning organism could be developed by mutation and natural selection just once, anywhere in the world, in all the assumed expanse of geologic time, is less than one chance out of a billion trillion. What possible conclusion, therefore, can we derive from such considerations as this except that evolution by mutation and natural selection is mathematically and logically indefensible! Explain why this reasoning is incorrect (or, if you agree with it, defend it). Hard copy of your (concise!) report due in class Thursday 19th October. .