It is partially dominant. So three levels of _expression_.

May be some modifiers of the pigment so differences in depth of
colour.

Chuck Chapman

-----Original Message-----
From: thomas silvers <t*@yahoo.com>
To: iris-photos <i*@yahoogroups.com>
Sent: Fri, Jun 7, 2013 2:41 pm
Subject: [iris-photos] Re: Re: HYB: Selection for PBF (purple based
foliage)

Â
Aha... it probably IS Mendelian but how just many loci are involved in
the degree of _expression_. If there weren't at least a few modifiers
involved, why would there be such a range in _expression_ of PBF (from
faint trace all the way to bold) even among diploids? Dosage at a lone
locus would only explain 3 categories - dark(or high up), medium and
none - right?

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What if PBF is a Mendelian trait.?

Chuck Chapman