outgroup versus ordered characters in Cladistics
Olivier De Clerck
Olivier.Declerck at RUG.AC.BE
Tue Jun 22 11:21:30 CDT 1999
Recently we were wondering in the department about the difference
between defining an outgroup in a parsimony analysis and explicitely
stating that the characters are ordered.
If one creates an outgroup in a parsimony analysis, which has a
0-value for a two-state character, does this automatically mean that
the 1-value is the apomorphic state and 0-value the plesiomorphic
state? I would presume it is. BUT what is in this case the additional
value of defining that the characters are ordered (0-value =
plesiomorphic ; 1-value = apomorphic)?
Additional question: is there a difference between Hennig86 and Paup
on this point?
Looking forward hearing from you,
Olivier De Clerck.
Dr. Olivier De Clerck
K.L.Ledeganckstraat 35 - B-9000 Gent, Belgium
tel 9-264.50.64 / fax 9-264.53.34 / olivier.declerck at rug.ac.be
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