Annoying Creationists
This in effect is ignoring potentially harmful mutations in the non-binding site region of the genome. Once you have several good binding sites in the binding site region of the genome, it is very unlikely that these creatures will ever be selected against because of the high values of valuation[p] for these sites which will nullify whatever happens in their nonbinding site regions.
For a good discussion of how the weight matrix is used to compute a match, see the paper An Evaluation of “Ev” by I.G.D Strachan which is available on the internet. http://www.iscid.org/papers/Strachan_EvEvaluation_062803.pdf
The binding site region is the portion of the genome where a match to the weight matrix is considered to be correct. In Dr Schneider’s original selection scheme, a failure to match in this region causes an error, where as matches in the region not assigned to the binding sites do cause errors. Now Unnamed is using the value summed from the weight matrix minus the threshold to determine the selection. The problem with this is his variable sv is biased to the matches in the binding site region. The value obtained from a good match of the weight matrix to a particular position in the binding site region gives a large value to valuation[p] which will dominate the selection process against poor matches against sites in the non-binding site region of the genome. Once you have a good match to a binding site in the binding site region, the large value for valuation[p] for that binding site will prevent a mutation which causes a match (albeit poor) in the non-binding site from affecting the selection process because valuation[p] will be a smaller in magnitude for that erroneous match. Erroneous matches in the non-binding site region no longer are exerting as much influence on the selection process.Kleinman said:What is the value for valuation[p] for a match in the binding site region versus a mismatch in the non-binding site region? If valuation[p] in the binding site region is much greater than valuation[p] in the non-binding site region, you have reduced the weight of errors in the non-binding site region. This is equivalent to ignoring harmful mutations in the non-binding site region. And as we all know, most mutations are harmful.Paul said:What do you mean by "binding site region"? There are binding sites and then there are all the other positions on the chromosome.
This in effect is ignoring potentially harmful mutations in the non-binding site region of the genome. Once you have several good binding sites in the binding site region of the genome, it is very unlikely that these creatures will ever be selected against because of the high values of valuation[p] for these sites which will nullify whatever happens in their nonbinding site regions.
For a good discussion of how the weight matrix is used to compute a match, see the paper An Evaluation of “Ev” by I.G.D Strachan which is available on the internet. http://www.iscid.org/papers/Strachan_EvEvaluation_062803.pdf