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RE: Radiation Hormesis -- or not
Interesting. In that case cancer cells have a
distinct advantage in evolution. They represent an
immortal cell line. Bummer to the host human.
--- "Flanigan, Floyd" <Floyd.Flanigan@nmcco.com>
wrote:
> In my view, it is not whether the favor falls with
> positive or negative mutation, rather the likelihood
> of the survival of the subject cell, plant or
> organism. If the mutation is an improvement, the
> subject would tend to thrive and reproduce, possibly
> passing on the trait to one or more of its
> offspring. This improves the subject down-line and
> would theoretically make it stronger and more likely
> to survive than any non-mutated subjects of the
> preceeding down-line.
>
> Floyd W. Flanigan B.S.Nuc.H.P.
>
> -----Original Message-----
> From: John Jacobus [mailto:crispy_bird@YAHOO.COM]
> Sent: Tuesday, January 27, 2004 7:37 AM
> To: Neil, David M; Carl Speer;
> radsafe@list.vanderbilt.edu
> Subject: RE: Radiation Hormesis -- or not
>
>
> That is my point. ". . . a mutational effect, which
>
> changes random genes, would produce random
> phenotypes.
> ." While they are not uniformly superior neither
> are
> they uniformly inferior.
>
> I am not a expert in plant genetics, so may be the
> irradiation of seeds is a hormetic effect. I raised
> the question since it is frequently cited, and I
> have
> not seen any detailed study of genetic changes,
> which
> to me are not hormetic. I think someone else said
> that chemicals can also cause drastic changes in
> plant
> responses. This is all well and good, but what is
> the
> implications to humans?
>
> --- "Neil, David M" <neildm@id.doe.gov> wrote:
> > Why would a genetic mutation favor a negative
> > effect? Because there are lots more ways to "do
> it
> > wrong" than there are to "do it different but
> > right". Change as little as one peptide in
> insulin,
> > for example, and you don't survive to breed
> without
> > medical support.
> >
> > To use your example, proto-primates which could
> grip
> > better (within natural variation) could climb
> > better, and therefore could escape danger easier
> > and survive to breed, and also had easier access
> to
> > food (either pick-a-fruit or grab-a-bug) and
> > therefore bred more frequently, more successfully
> > and longer.
> >
> > As stated, the uniformity of the effect indicates
> > the nature of the effect: a mutational effect,
> which
> > changes random genes, would produce random
> > phenotypes, not uniformly superior phenotypes.
> >
> > Dave Neil
> > B.A. Zoology, University of South Florida
> >
> >
> > -----Original Message-----
> > From: John Jacobus [mailto:crispy_bird@yahoo.com]
> > Sent: Monday, January 26, 2004 2:17 PM
> > To: Neil, David M; Carl Speer;
> > radsafe@list.vanderbilt.edu
> > Subject: RE: Radiation Hormesis -- or not
> >
> >
> > Why would a genetic mutation favor a negative
> > effect?
> > After all, evolution shows that genetic effects
> are
> > positive since they allow the organism to adapt.
> > Primates did not get opposed thumbs by willing it
> to
> > happen. It was genetics.
> >
> > Again, my statement was that it should have been
> > checked to see if it was a genetic mutation by
> > following the growth pattern of the off-spring.
> >
> > <SNIP>
>
>
> =====
> +++++++++++++++++++
> "I have sworn upon the altar of God, eternal
> hostility against every form of tyranny over the
> mind of man."
> Thomas Jefferson
>
> -- John
> John Jacobus, MS
> Certified Health Physicist
> e-mail: crispy_bird@yahoo.com
>
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=====
+++++++++++++++++++
"I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man."
Thomas Jefferson
-- John
John Jacobus, MS
Certified Health Physicist
e-mail: crispy_bird@yahoo.com
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