Re: HYB: punnett squares for TBs (Facebook discussion)
iris@hort.net
  • Subject: Re: HYB: punnett squares for TBs (Facebook discussion)
  • From: B* W* <a*@aol.com>
  • Date: Sun, 9 Feb 2014 10:45:38 -0500 (EST)
I would like to make an appeal to those working with iris breeding, even the
ones that don't expect anyone will ever know!  I've kept pretty good records
in some directions;however, I've not kept a good record on the "bad
seedlings."  This means that in most cases, I can't tell you what all of the
siblings looked like.  Only a general memory.


So my appeal is for everyone to take those boring notes on the ones that
didn't matter.  See that someone that works with genetics, like Chuck, gets
the information.  Pictures help.


This will help everyone that works with iris.



<<Mostly as Keith was keeping good records
that Kidd could use. Geneticists need lots of good data  to work with.
Without it  you are just working at theories. That is why I'm always
asking people for data, particularly on long crosses. >>




Betty Wilkerson
Zone 6 KY
autmirislvr@aol.com




-----Original Message-----
From: Chuck Chapman <irischapman@aim.com>
To: iris <iris@hort.net>
Sent: Sat, Feb 8, 2014 11:02 am
Subject: Re: [iris] HYB: punnett squares for TBs (Facebook discussion)


Kidd's analysis of Keith's data showed plicata is far enough away from
kinetechore  to be independent. Thus  tetraploid genetics operate on
random sorting, rather then  strictly  a  Punnett square assortment.
But  Punnett square still gives best predictions. The plants  don't
care what the genes are, they will all still sort out  via tetraploid
genetics. It would take specific data to assess what distance genes are
  from kinetechore and thus how much independence. That is if you can
identify a single gene affecting  phenotype.  As far as I know, Kidd
only looked at plicata  genes. Mostly as Keith was keeping good records
that Kidd could use. Geneticists need lots of good data  to work with.
Without it  you are just working at theories. That is why I'm always
asking people for data, particularly on long crosses.  I don't get good
  success rates on a lot of crosses in my problematic climate so  have
less data  then I would like to  work  out gene effects.

Chuck Chapman



-----Original Message-----
From: Linda Mann <lmann@lock-net.com>
To: iris <iris@hort.net>
Sent: Sat, Feb 8, 2014 11:42 am
Subject: Re: [iris] HYB: punnett squares for TBs (Facebook discussion)

Chuck, do you know if that has been observed for other iris genes -
patterns, rebloom, pigments?

Is 1/576 as high as the probability for this type of event gets?

On 2/8/2014 8:32 AM, Chuck Chapman wrote:
> One of the special features of tetraploid genetics is the possibility
of
> doubling up on a gene that is present only once. something that is not
> shown or predicted in a punnett square.
>
> This happens as  chromosomes are doubled during meiosis, so you are
> choosing from 8 choices, not four.  So  you can, for example, get a
> plicata from a cross  where there is only one plicata gene in each
> parent.  Kidd calculated this to be 1/576, if  plicata genes is at a
> distance from kinitochore of the gene [chromosome?] it is on. Lower
if it is close to
> kinitichore.  Kidd used some data from Keith Keppel to show that it
does
> happen and is not just a theory.
>
> Chuck Chapman

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