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This is a great post...

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Posted by: Rainshadow at Fri Apr 30 17:17:10 2004   [ Email Message ] [ Show All Posts by Rainshadow ]  
   

And,I'm really glad someone besides myself expressed the idea! *lol* My opinion stems back to watching the whole thing unfold,and,I believe that initially the "co-dominant" label was chosen as a sort of "fail safe"...presenting something new to a group of your peers,and,for that matter,public consumption,is not without a large degree of cautious skepticism,and,doubt...assuming,(based on what we know now.)that the founding animals were hets,it seemed from the first few breedings,that the term best described what was seen as evidence...the popular thought at the time being,(I think) if it was truely dominant,ALL of the subsequent offspring would express the trait,which was not the case,only roughly half did,the term "incomplete dominance" was kicked around,however,I believe that may be the term that you mentioned in your post,which is sometimes used to describe situations where there are degrees of expressive variance,(Paul,or,Ron,feel free to kick me if I'm wrong on that part! )...anyway, durring these early breedings is where we also got WAAAAY off course with the whole filial connotation thing; F1,F2,etc...and,we still have very successful breeders refering to F2 this,or,that,thinking that breeding two Salmon animals from completely different sources means the offspring are F2...they are not,and,I've gotten to the point,where I have to completely ingore these claims,and,simply ask,"were the parents siblings?"...the entire thing seems to be perpetuated by a lack of basic understanding in the significance of initially keeping track of related,possible gene carriers for the trait that is being explored,or,researched...the primary stumbling block in accepting Salmon/Orange-tails as a dominant trait,lies in confusing the transmissive nature of a given individual with the classification of the trait itself...there's no need to say that a "super" is "dominant",and,an "intermediate",(or het.) is "co-dominant"we should already know that...we are talking about two individuals expressing the SAME TRAIT,the exact same way we refer to albinos,and,hets...what is the trait? amelanism...what is the expressive status? het. or,homozygous,the only real difference is that with dominant forms,the hets express the trait,and,recessives don't...the transmissive result when bred,are the same.


   

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<< Previous Message:  Co-dominance and Occam's razor. - Barry M, Fri Apr 30 16:33:20 2004