IRON BARK EXPT

Note to the members of Pumpkins@mallorn

Heath Sharman of Australia is planning an interesting cross. If you are
interested in learning some genetics, his cross will be a good refresher
of your high school biology genetics. We will study his cross and
predict the outcomes on the genetics@onelist.com maillist. We welcome
anyone interested in genetics to join us for this exercise which will
last a couple weeks. We will allow you one day to join and not give more
info until Tues or Wednesday. If you plan to join, begin working on the
problem below, see what you can do before the answers come out
Wednesday. Meanwhile discussion of this on genetics is welcome. 
To Join ==> http://www.onelist.com/subscribe/genetics  it will be fun. I
don't know the answers yet. It will be fun figuring it out together. 

heaths@midcoast.com.au wrote:
> 
> 
> IRONBARK (Cucurbita maxima)
> Here in Australia my growing season does not start until september and does
> not finish until march, april. so somewhere in there i will try and do that
> cross.
> 
> Heath

  I am glad to hear that you plan the cross. I hope the folks on
Genetics list are interested in using Mendels Laws to predict what the
outcomes will be. Nic wrote that he is gone. Too bad he would enjoy
this. 

  Recall from my last e-mail that
Hr is hard rind
Hi is hard rind inhibitor (one dose of Hi is enough to prevent hard rind
in a plant that would otherwise produce hard rind. 
Since the symbols are capitalized, we know both traits are dominant like
brown eyes or semidominant like R = red in 4' o' clock flowers:
R/R gives red flowers; R/r gives pink flowers; r/r gives white flowers.
R/R is the genotype (one R allele from each parent)
red is the phenotype (what we see).

  Using pencil and thinking. What do you think the genotypes of each
parent  will be for the cross Heath plans to make. He plans to cross
Ironbark with AG.  In the beginning we shall assume the two loci are on
different chromosomes and therefore will assort independently in the F2. 
  
  Write a lines similar to this  
Parent 1 a/a  b/b
Parent 2 A/A  B/B
  You will have to make some assumptions  Please send a message to
genetics@onelist.com with your ideas and comments on assumptions you are
making or want to keep in mind. There is no correct answer we will have
make intellegent guesses about the genotypes of the parents.    

Here is Heath's Original message

Reply-To: From: "heath sharman" To: Subject: tough skin Date: Mon, 21
Jun 1999 18:31:45 -0700
X-MSMail-Priority: Normal X-Priority: 3 X-Mailer: Microsoft Internet
Mail 4.70.1161
MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit 

I was thinking about doing a cross next season on an AG. I was going to
cross the maternal
parent (AG) with pollen from an Ironbark pumpkin (you need a saw or axe
to break the skin). I
would like to here from anyone with an opinion about what would happen
or what I should look for
to keep the many useful traits from the AG e.g. size. But I want to get
the toughness in the skin just
like the Ironbark. Heath 
-- 
Harold Eddleman Ph.D. Microbiologist.       i*@disknet.com 
Location: Palmyra IN USA; 36 kilometers west of Louisville, Kentucky
http://www.disknet.com/indiana_biolab



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