BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Revisiting the question how many characters are needed to reconstr
 uct the true tree - Fischer\, M (CIBIV\, Vienna)
DTSTART:20110620T105000Z
DTEND:20110620T111000Z
UID:TALK31790@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:The question of how many sequence sites are required to recove
 r the evolutionary relationship of the underlying species accurately is im
 portant for phylogeneticists. It is known that a particularly challenging 
 problem for phylogenetic methods arises when a rapid divergence event occu
 rred in the distant past\, which leads to long pending branches and a shor
 t internal branch in the corresponding phylogenetic tree. \n\nWhile most p
 revious approaches tackling this problem considered only 2-state models\, 
 we investigate the scenario based on all four (DNA) character states. Part
 icularly\, we analyze a binary unrooted 4-taxon phylogenetic tree with a s
 hort interior edge and pending edges of multiple length. In my talk\, I wi
 ll present an optimal branch length of the interior edge in this case and 
 I will explain how many characters are at least needed to reconstruct the 
 'true' tree. \n
LOCATION:Seminar Room 1\, Newton Institute
END:VEVENT
END:VCALENDAR