[SpaceAgeRobin] RE: RE: Space Age Genetics

Chuck Chapman wrote: "A test of this would now involve crossing TB X the plants that seem to "Inhibit" SA or could be 0 dosages of SA. If the partial dominance theory is correct then this cross should produce almost no SA as would the inhibition theory but F2 would sort out in a punnett square analysis. I havn't yet checked if F2 would distinguish one idea from the other."
 
The SAGE plan cross type 2 is exactly what you suggest--non-SA-producing parents X SA.  Francelle's seedlings suggest she has this sort of thing going with those she mentions in her recent post.  I am in hopes she will let one of us try one or more of those seedlings, even though they have not got the merit for "keepers" otherwise, they do have the F1 genetic profile, perhaps, you are describing.
 
It will take a back cross to the SA's to generate SA's, one would assume.  Interpreting those results, however, could get hairy.
 
One thing that fascinates me are the varied reports from Mike Sutton.  Mike mentions that *most* TB's give at least some SA seedlings when crossed with them.  A few, such as YAQUINA BLUE give not only advanced type (flounced for example) but quite a percentage of them.
 
On the other hand, he mentions several that give few or no SA's, such as Quito and Dynamite.  Romantic Evening is another that is a non-producer of SA offspring.
 
Yet, a child of Romantic Evening, WILD WINGS, showed a single fall in a row in their field with a fully developed flounce.  This demands explanation, as normally such an event would be iterpreted to be a sectional chimera where an enzyme or hormone had its DNA or RNA track disrupted, allowing the flounce to be expressed.
 
Suggesting a deletion type event or a single locus change of some sort is far easier to account for than any addition of a genetic element.  Chimeras of this type are nearly always destructive, not constructive in nature.
 
We have much work to do!
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