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Re: HYB: Pigments 101 -- "Final Exam"

I'm glad Sharon went to the trouble to send this post.  Now the muddle I was
making makes
more sense.

 >In practice, most hybridizers have already selected for a specific trait
>are working with stock for which earlier sets in the epistatic series have
>been stabilized.  Allele-based models are therefore not only appropriate
>much easier to use.

May I presume that line breeding leads to stock with more or less stable
which then lend themselves to the simpler allele-based model as a practical
application even though the epistatic rules apply in a real sense?

>Now for the kicker:  Remember that it's quite possible to have two separate
>sets of alleles that control different chemical pathways with similar
>in appearance.  We went into this in some detail when we were discussing
>dominant inhibitors found in TBs.

I have gathered that the chemical pathways are controlled differently in the
iris species, e.g. dwarf and aril species as opposed to the TBs.  So as a
result it has
been difficult to get a true pink arilbred, or is this off base?  But since
TBs are the
result of long years of hybridizing of different species, wouldn't they have
a lot of
built in epistatic surprises when you wouldn't expect one?  Just sitting
there waiting
for the right cross in order to put in an appearance?

Donald Eaves
Texas Zone 7, USA

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