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  Topic: Southstar's thread< Next Oldest | Next Newest >  

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Joined: Oct. 2009

(Permalink) Posted: Dec. 07 2011,10:41   

Quote (Southstar @ Dec. 07 2011,09:57)
Quote (oldmanintheskydidntdoit @ Dec. 06 2011,13:03)
Perhaps this recent example?

Lizards Undergo Rapid Evolution After Introduction To A New Home

“Our data shows that evolution of novel structures can occur on extremely short time scales. Cecal valve evolution probably went hand-in-hand with a novel association between the lizards on Pod Mrcaru and microorganisms called nematodes that break down cellulose, which were found in their hindguts.”


The objection made to this article is that there is no proof of novel genetic material in the study. Actually in all fairness it does state "Tail clips taken for DNA analysis confirmed that the Pod Mrcaru lizards were genetically identical to the source population on Pod Kopiste."

So one could assume that the mutations are only induced by the enviroment and are not genetic based?

another thing I have replied to this saying that the development of the Cecal valve which is only been developed on the lizards of one island can only be produced with an increase of the amount of genetic material. Would this be correct?

Or would it be possible that these genes were somehow latent and were only expressed when the animal turned to a heavier herbivourous diet?


One argument is that there is no such thing as 'novel genetic material'.  Almost all genetic material is Adenine, Guanine, Cytosine, or Thyamine... and the methylations thereof.

So in that respect, you can't have novel genetic material.  I guess what they are referring to is the sequence.

But a quick glance at a couple of sentences shows that very novel changes to the meaning of the system can be made with very minor changes to the sequence of letters.  For example:

The quick, brown fox jumped over the lazy dog.
The quick, brown fox jumped over the lady dog.

One change to one letter changes most of the meaning of the sentence.  

So 'novel' changes to the sequence are NOT required for the resulting protein to have a very different structure... and likely function.

Ignored by those who can't provide evidence for their claims.

  366 replies since Nov. 08 2011,06:46 < Next Oldest | Next Newest >  

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