Hi I actually use the PKU example as well to address the perceived immutability of genetically determined characteristics. As to my admittedly cryptic phrasing, I was referring to the immutability of the genetic influence on the manifested characteristic, as elaborated by Stephen. If I can quote a more credible source than myself for my wording, Plomin writes:
"The example of PKU serves as an antidote to the mistaken notion that genetics implies immutability, as discussed later." For the article go to http://www.uth.tmc.edu/clinicalneuro/institute/2005/Mazzocco's%20pdf's/Plomin%20Walker.pdf Take care Jim James M. Clark Professor of Psychology 204-786-9757 204-774-4134 Fax [email protected] Department of Psychology University of Winnipeg Winnipeg, Manitoba R3B 2E9 CANADA >>> <[email protected]> 18-Dec-09 12:46 PM >>> On 17 Dec 2009 at 22:15, Jim Clark wrote: > It also allows one to make the point that genetic does NOT > equal immutable, perhaps another factor in student resistance to genetic > hypotheses. I must demur, although perhaps only to the way this is expressed. Genetic causation does mean immutable. It is possible to reduce or prevent the secondary consequences of the genetic specification (a trivial example would be hair dye for people suffering from red hair; a non-trivial example the special diet used to treat PKU) but the genetic basis remains unchanged. It's still red under the blonde hair dye; the individual with PKU still can't metabolize phenylalanine. It is true that we are on the cusp of real genetic change through gene therapy; it may already be here in a few extraordinary cases. But in general, while we can ameliorate the consequences of a genetic specification, we cannot change the specification nor its direct consequence. Cautious note to the red-haired. I joke. I have nothing against red hair. Indeed, some of my best friends have red hair. Stephen ----------------------------------------------------------------- Stephen L. Black, Ph.D. Professor of Psychology, Emeritus Bishop's University e-mail: [email protected] 2600 College St. Sherbrooke QC J1M 1Z7 Canada ----------------------------------------------------------------------- --- To make changes to your subscription contact: Bill Southerly ([email protected]) --- To make changes to your subscription contact: Bill Southerly ([email protected])
