Any comments?

Ludvig Mortberg Agneta.Guillemot at historia.umu.se
Fri Nov 3 10:01:37 EST 1995


I claim the following is true:

When homologous sequences of DNA, aminoacids etc e.g the sequence of
bases in a gene, are compared between different organisms the
"phenetic distance" or "unrooted tree" does not always reflect the
true phylogenie of those organisms.


     A    B   C
      \  /   /
       \/   /
        \  /
         \/

To be short: In a "distance matrix meseurment" (unrooted tree) A and C
may show up as closer than A and B. 

I'm not saying this happens every time. I'm just saying it happens
sometimes. Can everyone agree on this?


Ludvig



PS.

(I believe that the small subunit of rRNA in mammals is "closer" to
amphibians than to birds.)




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