RE: [asa] Shark mutation

From: Alexanian, Moorad <alexanian@uncw.edu>
Date: Thu Aug 23 2007 - 14:07:36 EDT

Does the "closeness" of two species imply an ancestral connection between them? Could the extra #21 dyad that gives rise to Down syndrome have come about by a mutation? Do normal humans then evolved from Down syndrome ancestors?

 

Moorad

________________________________

From: asa-owner@lists.calvin.edu on behalf of David Buller
Sent: Thu 8/23/2007 1:29 PM
To: Jim Armstrong
Cc: ASA
Subject: Re: [asa] Shark mutation

I remember hearing in a debate (I think between Miller and Johnson) where Miller noted that with some whales (or whaleish animals) it only requires on mutation to determine whether or not there even will be a tale grown!
 
Would the antievolutionists care to make comments about gradualism?
 
-David

 
On 8/23/07, Jim Armstrong <jarmstro@qwest.net> wrote:

        I ran across this news item regarding the catch of a shark with
        appendages clearly resembling webbed feet.
        http://www.underwatertimes.com/news.php?article_id=73210864950
        I wonder how many simultaneous mutations (if any) were required for this
        to happen.
        Of course, it is no sure thing that this mutation happened in such a way
        as to be heritable.
        But that is not my point.
        The basic point here is that the muational sequence length may not be as
        great (and as unlikely!) as one might think to move from one morphology
        to another significantly different morphology.
        
        JimA [Friend of ASA]
        
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Received on Thu Aug 23 14:08:01 2007

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