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Re: yellow inheritance


Your post is very confusing to me and as indicated in his post,  by Joe
also. If we can not understand what you are trying to say, I am afraid
no one else will understand either. The dificulty is in going into a
discussion using  the genetic symbols without indicating what the
symbols stand for. Perhaps you are communicating with someone with whom
you have agreed what the symbols represent. But other people are also
reading and this subject is utterly confusing. You should not go faster
in your discussion than the reading audience can follow. If there is
anyone who does understand this gibberish, please tell me so and I will
shut up and learn something...but until then I suggest you explain the
use of symbols selected. They are unknown to the reading audience at
this point, IMO..

As for your question about how many genes control coloration  in hostas?

There are more than genes on nuclei which control coloration in hostas.
Where have you been during our discussion, asleep?

Jim Hawes

andrewl wrote:

> Ben wrote:
> >It is much simpler: green is always gg and yellow leaf is Yg
> to which halinar@open.org responded:
> RE:>>Don't you mean that green is yy and yellow is Yy? What is Yg?
> To which I pose the following;
> From what I can tell of this conversation, and my stumblings around
> into molecular bio, it seems to me that the equation is a bit more
> complicated than Yy or Yg.   Maybe it was gg and Yg on one set of
> alleles, but gg and Yb on another, and gw and Yw on another
> (respectively, pod and pollen parents).  Now 50% of the progeny would
> be Yellow and nuclear, but not because of a single gene.    Of course,
> leave it to me to take what is simple and make it complex, but
> consider this.   What I'm asking is, "how many genes are involved in
> coloration of Hosta"?
> Drosophila Melanogaster has three genes involved with the trait of red
> eye color.  The trait for red-eye color is carried on Chromosome 1that
> also happens to carry the gene for control of gender (X-Linked, I
> believe).  Crossing over in meiosis is not a rare event.  In humans,
> and most other eukaryotic species, meiosis cannot even be completed
> properly unless each pair of homologous chromosomes takes part in at
> least one crossover  (Biology, Starr & Taggart 1998, pg. 200).  The
> more distant the gene from the centromere, the higher the probability
> that a crossover will disrupt the linkage (ibid, pg. 201).   The
> crossover in Drosophila is so pronounced that in the F1 cross between
> a white-eyed, mininiature-winged female with a red-eyed, normal winged
> (wild) male, 50% of the offspring switch genotype with the gender
> intact (or you could look at it the other way).  In the F2 generation,
> 36.9% were recombinants on at least one of the traits.  The genes were
> swapped on the chromosome for sex in F1, but 36.9% switch back on two
> of these traits in the F2 generation (ibid, pg 200).  (Original work
> of Thomas Hunt Morgan).
> If this occurs in meiosis in Drosophila, it seems likely that it
> occurs in meiosis in Hosta.  The question I need to better understand
> is how likely is it that this crossing over occurs in MITOSIS, as well
> as meiosis, which eventually leads to sports.  (I just read Ben's
> article in AHS HJ, Vol 30. No. 1, pgs. 56-58), and while I could agree
> with Ben that mit rec is one very likely explanation of the origin of
> sports (as is crossing over in meiosis THE explanation for genetic
> changes, leading to plastid changes that lead to new phenotypes, both
> stable and unstable), I have some questions that need to be resolved
> regarding this statement that ALL Yellow progeny from a cross of a
> Yellow Cultivar with a Green Cultivar would be due exclusively to
> nuclear DNA changes as a direct result of the cross with the Yellow
> pollen parent.
> What percentage of the progeny would have been Yellow if the pod
> parent had been selfed?  Was there a control in this experiment?  Do
> you state this in an article and I've simply missed the reference?  If
> so, please let me know.
> BTW, would mitotic recombination in the meristematic tissues
> potentially INCREASE if one adds more water and sunlight during the
> early spring (or would this be more likely to simply affect those
> plants that are more subject to Chimeral Rearrangement).    Could one
> increase the appearance of sports simply by manipulating the variables
> of water and UV radiation?
> Also, I believe that Jim Wilkins article (HJ, V30, No1, Pg 58) which
> follows Ben's is pointing out that there is good cause to believe that
> coloration in Hosta is controlled by mulitple genes.  I am wondering
> about BZ's statement that "all sports that are due to chimeral
> rearrangement are identical".  A phenotypically and significantly
> different plant but it is genetically identical?  I'd like to see
> base-pair sequencing or geneome mapping that would back up this
> statement, Ben.  Can you point me to some research?  :-)
> P.S.  Has anyone begun the process of sequencing and isolating genes
> that influence coloration in Hosta?  Maybe Ben Lockhart or Frank
> Riehl?
> P.S.S.  My next question Ben may be about linkage mapping as a means
> to better understand sporting.  I probably have to sign up for a class
> and send you money before you'll venture into that discussion.  :-)
> --
> Andrew Lietzow
> #1 Plantsman at http://hostahaven.com
> 1250 41st St
> Des Moines, IA 50311-2516

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