genetic vs morphological trace of phylogeny
pierre.deleporte at UNIV-RENNES1.FR
Tue Apr 13 13:07:13 CDT 2004
A 18:05 12/04/2004 -0400, Herb Jacobson wrote:
>Since DNA is cladistic,
more precisely: can be analysed cladistically (and phenetically, and any
way you like). For "cladistic" never qualified characters (contra John
Grehan's obstinate statements).
>I was also in error about the need for sequences to
>have clock-like or regular mutation rates. Like morphological studies, sister
>clades can diverge at different rates. Mutation rates are, as I think Pierre
>said, a measure of phenetic differences between clades. Here the phenetic
>information is added to a cladogram and not used to make the it. This
>provide a test for sequences thought to have regular mutation rates. Again I
>think Pierre said that, but I hate to put words in his mouth.
No problem, you get the essential of it.
>However, in some studies phenetic differences are used as a proxy for time
>and there, I would assume, the sequences used would have to have regular
>mutation rates. In these kinds of if sister clades had different mutation
>would mean that they split at the same time but arrived at the present at
Or at different "evolutionary speeds". Confrounting phenogram and cladogram
is effectively a way to check after possible regularity of evolution.
You're certainly not a person targeted as refusing to learn !
I'm certain I also learn a lot on taxacom, including about Pongo's morphology.
But logics is logics...
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