Re: HYB: Pigments 101 -- "Final Exam"
- To:
- Subject: Re: [iris-talk] HYB: Pigments 101 -- "Final Exam"
- From: D* E*
- Date: Tue, 26 Dec 2000 18:20:59 -0600
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
and
>are working with stock for which earlier sets in the epistatic series have
>been stabilized. Allele-based models are therefore not only appropriate
but
>much easier to use.
May I presume that line breeding leads to stock with more or less stable
traits
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
effects
>in appearance. We went into this in some detail when we were discussing
the
>dominant inhibitors found in TBs.
I have gathered that the chemical pathways are controlled differently in the
different
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
donald@eastland.net
Texas Zone 7, USA
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