September 28, 2004 12:33PM
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Registered: 19 years ago
Posts: 2,645
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bernard Wrote:
-------------------------------------------------------
>
> For some reason you are getting hung up and
> excited with "gene activation" 1) What is meant by
> life having the same code is that the same three
> bases in DNA code for the same amino acid in all
> life. It NOT that all the genes in all life are
> the same and the differences between species is
> what genes become "activated." You really need to
> get some of the basics of evolution down.
>
>
Okay let me do some more research here. I wasn't actually talking about the bases - more about the fact our genes are 98% the same as chimps and even 50% the same as bananas...
>
> Hence the fact that the genome
> > of the same sex in chimps and humans can be
> more
> > similar than those of the different sexes.
>
> Who in the world ever said that?
>
I can't remember where I read the article - I have a feeling it was the Economist funnily enough but this type of content there seems to need a subscription.
But its along the lines of these;
[
www.newscientist.com]
[
www.newscientist.com]
> So if
> > a gene become activated during reproduction,
> isn't
> > that evolution (at some level) at work ?
>
> YOu are taking a very small and unusual process
> (prions in yeast) and trying to extrapolate it way
> beyond its realm of its validity.
Okay but its if we don't know half of what prions do in humans then there is a possibility it could be similar ?
> This entire
> "gene becomes activated' concept. is being
> misconceived. Let's recap. What the yeast research
> says is that under certain conditions a unique
> thing happens in ONE organism (the yeast) with no
> evidence that it happens elsewhere. This is that a
> protein (Sud35) can be shifted in conformation to
> become a prion. When this happens its function is
> disrupted and the yeast's transcription machinery
> produces proteins based on the DNA code in the
> "non-coding" portion of the yeast's genome. This
> is NOT activating a gene.
So when you have one cell where a certain type of proteins are being created to make, say a dermal/skin cell, and another cell in the same body is creating certain type of protein to make, say, a cell in the kidney, what do you call the state of the different gene from which this protein is being created in both cases ? Is it not "activated" ???
> What is produced is the
> equivalent of producing mutations at a rate higher
> than would be normally expected.
Are you saying this is all Lindquist is claiming ?
> Mutations are
> most often not beneficial (as is the case here 80%
> of what is produced). The paper (which I have not
> yet read in the original) claims that some
> resistance to paraquat was found. This is not
> analogous to an immune response.
>
[
www.pnas.org]
[
www.pnas.org]
> Ordinarily in genetics gene activation refers to a
> gene whose function is to turn another gene on or
> off. Both are encoded in the DNA and are subject
> to the normal processes of evolution. It has no
> similarity to the yeast situation.
>
Okay I will read up a bit more on the but could you clarify whether you rekon I've got this wrong. When the first generation of yeast were first exposed to this disease they didn't produce this protein that protects them, then when the next generation was 'born' (from the ones that had developed resistance) they instantly produced this protein that gave protection ?
Simon
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Simon |
September 17, 2004 05:55AM |
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wirelessguru1 |
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Salsassin |
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wirelessguru1 |
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wirelessguru1 |
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Salsassin |
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wirelessguru1 |
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Salsassin |
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wirelessguru1 |
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wirelessguru1 |
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Anonymous User |
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wirelessguru1 |
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Salsassin |
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Simon |
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Simon |
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Salsassin |
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Joanne |
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Joanne |
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bernard |
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bernard |
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bernard |
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bernard |
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Simon |
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Simon |
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bernard |
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Simon |
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bernard |
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Simon |
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Simon |
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Simon |
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Simon |
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bernard |
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wirelessguru1 |
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Simon |
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Salsassin |
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wirelessguru1 |
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Salsassin |
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Salsassin |
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Salsassin |
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