RE: Return to Genetic ramblings

I guess, following the redhead theory...if two redheads have a child, it
will have red hair.  If a redhead and someone with one red hair gene have a
child, they have a 50% chance to have a redhead.  If two people with one
redhead gene each have a child, they have a 25% chance to produce a redhead.
However, if a redhead and someone without the red hair gene have a child, it
can not have red hair.

This is confused in the squash world by a number of things:

#1 	What we call the mother and father are the parents of the seed, not
the fruit itself.]
#2	Green is a natural color for plants, begging the question of whether
there is a green color gene or a NO color gene.
#3 	Environmental factors also can affect the color, such as shading.

Something else we might want to consider, this may be more like the skin
color gene in humans.  If two (people of African decent) have a child, it's
skin color will be (of African decent).  If a (person of African decent) has
a child with (someone of a different color), the child can be a mix of the
two.  (Boy, this is difficult to say in our PC world.)

Therefore, since we have seen partially green fruit, orange fruit turn
green, etc., might we compare the gene to the color gene in humans?
Therefore it is not a black and white issue...there I said it.


-Gus

 -----Original Message-----
From: 	Cliff Warren [c*@hotmail.com] 
Sent:	Wednesday, February 19, 2003 10:06 AM
To:	pumpkins@hort.net
Subject:	RE: Return to Genetic ramblings

>Then why is it that a green fruit sometimes (often, depending on the seed)
>produces orange fruit?

Well, because the cross that produced the seed in the
fruit is different from the fruit itself... That is,
if we assume that it's just one gene, then the seed
would inherit green genes from the mother plant, and
possibly something else from the pollinator.

If we assume that the mother plant had "bb"
as it's color gene, and the pollinator had "BB" or
"RR", then the offspring would be "Bb" or "Rb", and
would have the big B color (cream-orange) or big R
color (reddish-orange). (I think there are a lot of
assumptions here...!)

If the pollinator was something like "Rb", then, as
each pollen grain could be different, then some seeds
would carry on the "bb", while others could become
the "Rb". Some would throw squash, some would be red.

It's like Kevin Smith's patch last year, if I understand
it right, Kevin planted several seeds that looked as
if they would give squash, but all his fruit turned out
with the "R" gene, a beautiful (eye of the beholder)
red color. Somewhere in the mix the red genes took hold!

Then on the other hand, some things are unexplained to
me, such as Kirk Mombert's 723 plant in 2001. He had a
tremendous squash and pumpkin on the same plant. True
that both were pale, but when they're growing on the
same plant, they should have the same genetics, right?
That is something that our simplified model does not
explain.

The 723 Bobier seems to be one of those seed stocks where
some seeds fall on one side and some on the other.

Regards, Cliff





>From: "Smithhisler, Paul" <Paul.Smithhisler@dnr.state.oh.us>
>Reply-To: pumpkins@hort.net
>To: "'pumpkins@hort.net'" <pumpkins@hort.net>
>Subject: RE: Return to Genetic ramblings
>Date: Wed, 19 Feb 2003 07:22:06 -0500
>
>Good question Kathie.  In humans, the only way to get a red-head is by from
>two people with the read hair gene.  Since the red-hair gene is recessive,
>it would follow that two redheads definitely each had two red-hair genes.
>Therefore, would their offspring necessarily have red hair?  My
>understanding of human genetics is that yes, they would.
>
>Then why is it that a green fruit sometimes (often, depending on the seed)
>produces orange fruit?
>
>-Gus
>
>  -----Original Message-----
>From: 	Kathie Morgan [f*@earthlink.net]
>Sent:	Tuesday, February 18, 2003 8:51 PM
>To:	pumpkins@hort.net
>Subject:	Return to Genetic ramblings
>
>Cliff Warren wrote: Take 10 to 15 seeds from a desired stock. Plant
>them, then save another set selected from the very best of what grows.
>
>OK, I'll buy a representative sample.
>Now, someone said - was it Brock - that green color is thought to be
>recessive. In that case, breed a Green to a Green and you're certain to
>get Green, if I am not mistaken. But am I not?
>Kathie
>
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