Re: Some Cyclical Process Before the First Replicator
- From: "Perplexed in Peoria" <jimmenegay@xxxxxxxxxxxxx>
- Date: Wed, 8 Oct 2008 12:07:10 -0400 (EDT)
"Tom Hendricks" <tom-hendricks@xxxxxxx> wrote in message news:gce66f$241u$1@xxxxxxxxxxxxxxxxxxxxxx
Most origin scenarios have a replicator pop up - a single fluke event. Then
if they are honest they'll admit the odds of this happening are so
astronomical that it didn't happen or really couldn't happen.
I suggest that a more plausible scenario is this:
Before the first replicator there was some type of chemical process that
produced RNA variations - probably a sun forced cyclical process. And this
was such a productive process that it produced all types of variations of
RNA: folded or double stranded, plus different mixes of purines and
pyrimidines, etc.
This process produced one variant that was a first replicator, or even more
likely, many versions of replicators. And that this first group of
replicators led to a 'best of' as we know it now.
But what process would do that? I suggest a process where the sun cycle
forces a denaturing and annealing cycle. The hot sunlight first denatures
RNA and disconnects some strands. Then in night the coolness anneals these
separate RNA into new variants. Day after day the process repeats until
certain replicators are made.
But overall the point is that some environmental forced process, produced
many variations in RNA that came before the first replicators. There was not
one fluke event, no 'pop and adapt' magical chemical wand tap.
Tom, what you have just described is the *standard* RNA first scenario. I
don't think there is any such thing in ANYBODY's mind as the "pop-and-adapt"
scenario that you describe. Everyone who believes in RNA-first believes that
the first (fluke) replicator was just one of a huge population of other RNA
molecules - all fairly big, all fairly complicated, but only one of which could
reproduce itself.
Which, to my mind, is a good reason for rejecting the entire RNA-first scheme.
Surely that first polymerase ribozyme would have "re-produced" the other
non-catalytic RNA molecules in the population far more often than it would
have "re-produced" itself.
At least in the Cairns-Smith "clay-first" story, being a replicator is no big
deal - everyone in the 'population' replicates, though some of them do it
better than others.
.
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