Several questions on evolution, and mutation (rate)
lkista at UNM.EDU
Tue Aug 27 14:16:46 EST 1996
On 27 Aug 1996, Joan Shields wrote:
> Stats haven't always been one of my strong points but there is something I
> think I can add - something I think a lot of people are overlooking.
> Whether or not is would take, on average, X numbers of tries in order to
> form amino acids - you have to remember that all those different
> combinations didn't/don't occur one right after the other - they can
> happen all at once. In other words, evolution doesn't just happen in a
> straight line - mutations occur everywhere and in every direction. If you
> look at mutations that have been successful, then it appears that
> evolution is going in a line (or meandering path).
I also recall something about "exon shuffling". Whole domains of enzymes
being encoded on a single exon and then new enzymes or proteins being
formed by recombiunation between exons.
Recombination in general is a powerful mechanism that most discussions of
evolution seem to leave out.
And let's not forget endosymbiosis!
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