Re: HYB: REB: genetics

Linda,
 
I'm intrigued by your mention of Punnet squares... I love Punnet squares!  I'll admit I haven't been paying much attention to discussions on rebloom genetics much less growth habits, so I can't really imagine what exactly you are trying to do.
 
Correct me if I'm wrong... a Punnet square presumes a Dominant and a Recessive... a positive or negative value.  But, I'm under the presumtion that "modern" iris genetics operates in a set of four values.... Tttt, TTtt, TTTt, tttt.... or some such, right?  so.... hmmm.. time to erase the wall board...
 
well, the square would have to have at least sixteen spaces... ... but you could technically set up six values...  
 
I'm gonna play... with pretend values.
 
christian...

--- On Fri, 5/30/08, Linda Mann <lmann@lock-net.com> wrote:

From: Linda Mann <lmann@lock-net.com>
Subject: [iris] HYB: REB: genetics
To: iris@hort.net
Date: Friday, May 30, 2008, 9:54 AM

Sharon, I have been sitting in front of the AC & fan between chain 
sawing and stacking bits and pieces of trees, trying to draw theoretical 
punnett squares for rebloom and need more dimensions than my poor aging 
brain can manage!

I've tried various theoretical combinations of dominants, recessives and 
dosages for one and two different kinds of "rebloom" genes, but
can't 
handle combining <that> with 4 to 6 more sets of genes for rapid growth, 
pH sensitivity, daylength, night-time temperature regime etc etc.

Chuck, have you already done some of this and come up with some testable 
probabilities?  Anybody know if Don Spoon has?

Is there software or does someone already have a spreadsheet set up that 
will calculate the probabilities?

The only data I have any good numbers for is that IMMORTALITY X 
CELEBRATION SONG cross, & the cross doesn't shed a lot of light.

IMM is a summer bloomer here (but not in Canada).  CSONG is a sporadic 
rebloomer here and there.  Out of maybe 80 seedlings that survived to 
transplant size from two different years of making the cross, about 50? 
survived to bloom.  Of those, only two are reliable cycle rebloomers 
(reliable if they don't get frozen), one tried to bloom in winter once.

I have very few seedlings from most other <individual> crosses involving 
IMM (or VIOLET MIRACLE, or TEA LEAVES (summer bloomers here), or HARVEST 
OF MEMORIES (cycle bloomer)), so nothing too useful for calculating 
probabilities.

 From the little data I do have, it looks like half sib crosses of 
non-reblooming IMM offspring have about one chance in 36 of 
reblooming....not to mention all the other qualities I want.

Is this where the issue of growing 10,000 seedlings to get one of what 
we want comes into play?

Groan....

I know, it's bloom season elsewhere, not the time to be asking this kind 
of complicated question.
-- 
Linda Mann east Tennessee USA zone 7/8
East Tennessee Iris Society <http://www.DiscoverET.org/etis>
Region 7, Kentucky-Tennessee <http://www.aisregion7.org>
American Iris Society web site <http://www.irises.org>
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