Re: HYB: punnett squares for TBs (Facebook discussion)
iris@hort.net
  • Subject: Re: HYB: punnett squares for TBs (Facebook discussion)
  • From: C* C* <i*@aim.com>
  • Date: Sat, 8 Feb 2014 13:09:19 -0500 (EST)
No. several crosses added up. And it was a one way crosses. That is one parent having just one plicata gene x plicata (if I remember correctly). I'd have to look it up for more details. But a situation where you would get no plicatas without the tetraploid randomization.
Found it. bulletin 221 April 1976. "Tetrasomic segregation at the plicata locus". Also see his article in #193. 

Chuck Chapman

-----Original Message-----
From: Linda Mann <lmann@lock-net.com>
To: iris <iris@hort.net>
Sent: Sat, Feb 8, 2014 12:46 pm
Subject: Re: [iris] HYB: punnett squares for TBs (Facebook discussion)

So Keith had at least 567 seedlings from one type of cross in order to
get those data?

Half a lifetime of careful work and record keeping.

On 2/8/2014 11:55 AM, Chuck Chapman wrote:

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


Linda Mann

---------------------------------------------------------------------
To sign-off this list, send email to majordomo@hort.net with the
message text UNSUBSCRIBE IRIS

---------------------------------------------------------------------
To sign-off this list, send email to majordomo@hort.net with the
message text UNSUBSCRIBE IRIS
Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index