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What is the accepted assigned genetic symbol for blue in the Domestic Pigeon?

 A New Year's surprises was that after renovation the homepage several links  to older contributions changed. That unfortunately holds also for some links posted recently. Contributions to the use of symbols can be found right now

 http://www.taubensell.de/011_Neu_Archiv/zum_und_vom_gebrauch_von_symbole_teil1.htm

http://www.taubensell.de/011_Neu_Archiv/zum_und_vom_gebrauch_von_symbole.htm

 The reason for posting the links was the provocative questions by Ken Davis in a Facebook group for pigeon genetics. What is The Accepted Assigned Genetic Symbol for Blue in the Domestic Pigeon?" The debate has shown that one can indeed basically agree on the state of facts, but nevertheless can dispute long on the form, or in this case the proper symbols to characterize the facts.

Blue for W. F. Hollander, Joe Quinn and later authors is defined as the reference standard, the wild-type in the appearance of the blue black barred rock pigeon. As a symbol + is applied when it comes to the blue-gray color, + when it comes to the bar pattern, + also, when it comes to the featherless legs, the absence of other feather structures etc.

 The wild-type device in our consciousness by the fact that there have been at a specific location on a chromosome mutation as a deviation from the wild type. W. F. Hollander has the question recorded indirectly in a humorous fictional conversation in his 'Origins and Excursions in Pigeon Genetics' of 1983 at p. 20f. " Don't you talk about a gene for recessive red, or a gene for dilution?" -"Indeed we do. Those are units identified by being different from blue. Blue is the wild-type, normal, standard of reference. Recessive Red or dilution are departures, changes, single and identifiable. Many other mutants are also known." - "Then blue isn't single and identifiable?" - "Correct!..."

 If there is agreement on these facts, then it's all about the question of how you can make most conveniently clear that you want to talk about the wild-type at the locus of a specific mutant.