Re: [asa] Shark mutation

From: David Campbell <pleuronaia@gmail.com>
Date: Fri Aug 24 2007 - 11:44:11 EDT

 The photo seems to show a somewhat abnormal (or deliberately altered)
set of claspers (used by male sharks in grasping the female) forming
the "webbed feet"-pelvic and pectoral fins appear normal. The end of
the article confused this phenomenon with the coelocanth.

A single gene turning tails on or off might be the tunicate study
(larval or larviform sea squirts-urochordates, in the same phylum as
vertebrates).

Closeness of two species is expected if there is a relatively recent
evolutionary common ancestor, though "closeness" needs measured
various ways. Closeness alone does not prove evolutionary
connection-a mechanism must exist to make the transition. The
closeness of Downs Syndrome individuals to ordinary humans correctly
indicates that the former is descended from the latter, but the
closeness of some statues to humans does not.

The mention of additional malaria species is quite significant as an
additional problem in Behe's calculation of probability-mutations
present in closely related species could potentially have been
transferred through hybridization. Not that their reproduction shows
significant similarity to malaria, but the transfer of a gene from a
closely related species (probably via hybridization) resulting in a
significant effect for the life of the recipient species is documented
for the hawthorn fly. The North American hawthorn fly is in the
process of splitting into two species, the new one being specialized
for apples instead of hawthorns. The apple fly has apparently picked
up some genes from the Mexican hawthorn fly that affect developmental
timing.

-- 
Dr. David Campbell
425 Scientific Collections
University of Alabama
"I think of my happy condition, surrounded by acres of clams"
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Received on Fri Aug 24 11:44:28 2007

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