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Re: Birds, no mosasaurs [VERY long & theoretical]



>In a message dated 98-02-25 00:20:26 EST, th81@umail.umd.edu writes:
>
><< And the fact that an "A" can only change to a "T", "C", or "G": other
> options being unavailable in Terran life. >>
>
>Most morphological characters are not even four-state but only two-state
>(e.g., present-absent, wider-narrower, touching-not touching, etc.). This
>makes long branch convergence >more< likely in morphological analysis than in
>molecular analysis.



In whose analysis?  Try talking to an entomologist or botanist sometime -
I've seen characters in their analyses with up to 15 states.



chris




-=--=--=--=--=--=--=--=--=--=
Christopher Brochu, Ph.D.

Postdoctoral Research Scientist
Department of Geology
Field Museum of Natural History
Lake Shore Drive at Roosevelt Road
Chicago, IL  60605  USA

phone:  312-922-9410, ext. 469
fax:  312-922-9566

cbrochu@fmppr.fmnh.org