tips vs nodes

Dmitri Sherbakov sherb at srv01.lin.irk.ru
Wed Jun 7 19:17:07 EST 2000


Dear netters,

I came across a dataset of 18S rRNA sequences of algae, where phylogenetic 
analysis suggests the following:

A->B->C->D            (1)

instead of "normal"

A   B   C   D         (2)
!   !   !   !
+-+-+   !   !
  !     !   !
  +--+--+   !
     !      !
     +------+

due to zero or almost zero lengths of some branches.
Since the case (1) may be describe realistic evolutionary events, the
questions are:

Is it possible to built a test distinguishing between (1) and (2)?

Did anybody meet and not discard stuation like that?

Thank you in advance

Dmitri Sherbakov



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