[Taxacom] Derived characters (was: Evolution of human...)

Don.Colless at csiro.au Don.Colless at csiro.au
Tue Aug 9 23:56:10 CDT 2011


I'm afraid that Don doesn't know the answer, except by reading it off (as an estimate) from an already accepted cladogram.

Donald H. Colless
CSIRO Ecosystem Sciences
GPO Box 1700
Canberra 2601
don.colless at csiro.au
tuz li munz est miens envirun
________________________________________
From: taxacom-bounces at mailman.nhm.ku.edu [taxacom-bounces at mailman.nhm.ku.edu] On Behalf Of Sergio Vargas [sevragorgia at gmail.com]
Sent: 10 August 2011 05:02
To: taxacom at mailman.nhm.ku.edu; jgrehan at sciencebuff.org
Subject: [Taxacom] Derived characters (was: Evolution of human...)

Hi,

I would also like to know the answer, Don knows it already (apparently)
but I don't think the rest of us do.

So, How do you "demonstrate" that a character is "derived"?

I would also like to know how does restricting the data matrix to
characters exclusive to the ingroup affect the outcome of the analysis,
and whether this introduces a bias or not. If I am not wrong the only
problem with characters shared between the ingroup and the outgroups is
that the polarity of this particular character would be equivocal, but
the character it self could be used for phylogenetic inference.

txn

sergio

--
Sergio Vargas R., M.Sc.
Molecular Geo- and Palaeobiology Lab.
Dept. of Geo-&  Environmental Sciences, Palaeontology and Geobiology
LMU M√ľnchen
Richard-Wagner Str. 10
80333 Munich, Germany
tel. +49 89 2180 17929
s.vargas at lrz.uni-muenchen.de
sevra at marinemolecularevolution.org

check my webpage:
http://www.marinemolecularevolution.org

check my research ID:
http://www.researcherid.com/rid/A-5678-2011


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