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Re: Tiktaalik



Well, _actually_, that _is_ a small (though of course rare) change that
just _looks_ like a big one morphologically.

Yes. It looks like a big morphological change, because it *is* a big
morphological change. Sure, it was caused by a small developmental change;
but it's the resulting phenotype that's acted upon by natural selection.

It's just one mutation, it seems. BMP2 gets expressed in a place where it usually isn't.


The nice thing about mutations is that they _can_ be quantified -- counted. :-)