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Author Topic:   is the advancement of macro evolution without hick up?
Peepul
Member (Idle past 5018 days)
Posts: 206
Joined: 03-13-2009


Message 40 of 41 (548866)
03-02-2010 6:43 AM
Reply to: Message 11 by Dr Jack
02-27-2010 4:10 PM


Re: We Are All Mutants
quote:
The tRNAs needed to translate GGA to glycine or GGU to glycine exist in differing quantities; altering the code can alter the expression rate of proteins.
This is correct - and there is evidence from sequence studies that certain codons are selected over others that code for the same amino acid. So these changes are not invisible to selection.

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 Message 11 by Dr Jack, posted 02-27-2010 4:10 PM Dr Jack has not replied

  
Peepul
Member (Idle past 5018 days)
Posts: 206
Joined: 03-13-2009


Message 41 of 41 (548867)
03-02-2010 6:48 AM
Reply to: Message 33 by Dr Adequate
03-01-2010 7:03 PM


Re: We Are All Mutants
quote:
This may already have been answered a dozen times over, but isn't it the case that apparently neutral mutations that have been carried along in the genome for whatever reason can then capitalize on additional mutations that have beneficial effects but that might otherwise not have been possible? Actually, isn't that what you're already saying here?
I think this is what Lenski's experiments with E coli demonstrate. I'm ready to be corrected on this though!

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 Message 33 by Dr Adequate, posted 03-01-2010 7:03 PM Dr Adequate has not replied

  
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