Sequence data and cladistics

Tom Jeffries twjeffri at facstaff.wisc.edu
Sat May 13 22:29:43 EST 1995

I have recently been examining several different protein sequences 
(URA3, ADH, CYC) in yeasts and comparing the resulting trees to trees 
derived through comparison of ribosomal sequences.  

In general, ribosomal sequences are appropriate for determining 
relationships over rather long distances, but are less reliable in 
distinguishing closer species.  

Although not an exact relationship, whre data are available, trees 
generated by URA3, ADH and CYC separate related yeasts in similar ways.  
Also, contrary to popular opinion, unicellular ascomycetous yeasts form 
a monophyletic group.

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