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Author Topic:   Do only advantageous mutations fuel evolution?
Dr Adequate
Member (Idle past 284 days)
Posts: 16113
Joined: 07-20-2006


Message 11 of 28 (499085)
02-16-2009 4:17 PM
Reply to: Message 1 by Darwinist
02-15-2009 6:33 AM


Neutral and near-neutral mutations can also be fixed by genetic drift. So no.

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 Message 1 by Darwinist, posted 02-15-2009 6:33 AM Darwinist has not replied

  
Dr Adequate
Member (Idle past 284 days)
Posts: 16113
Joined: 07-20-2006


Message 13 of 28 (499176)
02-17-2009 12:43 AM
Reply to: Message 12 by RAZD
02-16-2009 11:44 PM


Re: evolution need neutral AND beneficial
Can't find the source right now, but in one study on e.coli, over some 20 or 40 years, IIRC, starting from a single parent, with generations divided and some preserved for later analysis, they ended up with a beneficial mutation that was enabled by a prior neutral mutation: those without the neutral mutation did not evolve the beneficial one, those with did.
You're thinking of this.
But I don't know if it's been determined yet that the original mutation (~ 20,000 generations) was neutral, just that it didn't allow metabolization of citrate.
Research continues ...

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 Message 12 by RAZD, posted 02-16-2009 11:44 PM RAZD has seen this message but not replied

  
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