The Major Transitions in Evolution - PowerPoint PPT Presentation

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The Major Transitions in Evolution

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Origins of Life - Brainstorming ... Kauffman s original polymer chemistry when enclosed in a finite space will eventually crystallize into the same attracting ... – PowerPoint PPT presentation

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Title: The Major Transitions in Evolution


1
Catalyst molecules help make a reaction happen,
but dont bind permanently. Like a frying pan
makes a grilled cheese the sandwich is served
without the frying pan attached.
2
Kauffman noted that the molecule created in one
reaction can become the catalyst for another. If
pairs of reactions created the catalysts for each
other, we would have a closed autocatalytic set.
3
Kauffman noted that the molecule created in one
reaction can become the catalyst for another. If
pairs of reactions created the catalysts for each
other, we would have a closed autocatalytic set.
A and B are food molecules providing the
energy to drive the system.
4
Kauffman hypothesizes that some autocatalytic
sets will be have faster cycles than others. They
will be selected in Darwins sense. Evolution
without a genomeeventually resulting in DNA.
5
Origins of Life - Brainstorming Workshop - CERN
2011
No rigorous analysis of the putative
evolvability of Kauffmans hypothesis has been
carried out so far. Previous analysis just
forgot that Darwinian evolution is a population
concept what is needed is to simulate a
population of compartments enclosing
autocatalytic sets.
6
Origins of Life - Brainstorming Workshop - CERN
2011
Can Kauffmans autocatalytic sets be units of
evolution?
No! The original Farmer-type networks always
have one attractor. Kauffmans original polymer
chemistry when enclosed in a finite space will
eventually crystallize into the same attracting
network and can never ever be a Darwinian
unit. However, the addition of rare novel
species can result in the ignition of a novel
self-reproducing viable loop. In this case
selection could work.
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