More on the 'cladistics' of sequences

Richard Jensen rjensen at SAINTMARYS.EDU
Mon Jun 7 08:36:24 CDT 2004

> I would start with some critical evaluation before the analysis to restrict
> the data set to potential synapomorphies. Then the evaluation after the
> analysis can take place with respect to one's initial determination.
> John Grehan

So, then, how does one objectively determine which characters represent
"potential" synapomorphies and which do not?  It seems to me that, in an
objective approach, one must assume that all characters represent potential
synapomorphies.  The analysis then provides information about which characters
represent synapomorphies and which reflect homoplasy.  And, what do you do with
the characters that were not included as potential synapomorphies?  Chances are
many of them will not fit the tree in question.


Richard J. Jensen              | tel: 574-284-4674
Department of Biology      | fax: 574-284-4716
Saint Mary's College         | e-mail: rjensen at
Notre Dame, IN 46556    |

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