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Activity Number: 351
Type: Contributed
Date/Time: Tuesday, July 31, 2012 : 10:30 AM to 12:20 PM
Sponsor: WNAR
Abstract - #306455
Title: Identifying the Rooted Species Tree from Probabilities of Splits Under the Multispecies Coalescent
Author(s): James Degnan*+ and Elizabeth S Allman and John A Rhodes
Companies: and University of Alaska Fairbanks and University of Alaska Fairbanks
Address: 47 Riselaw St, Christchurch, _, 8013, New Zealand
Keywords: phylogenetics ; genetics ; coalescent ; identifiability ; invariants
Abstract:

Evolutionary biologists often depict the history of speciation events as a branching process where a speciation results in a branch bifurcating into two descendant species. This results in a rooted tree called the species tree. Histories of individual genes shared by different species, called gene trees, often imperfectly track the species tree. In addition, most models of molecular evolution infer unrooted gene trees or splits, subsets of species on the unrooted gene tree that are separated from the other species by one branch of the unrooted tree. In practice, splits have so far only been used to infer unrooted species trees. Using invariants and linear inequalities for probabilities of splits, we show analytically that under the multispecies coalescent model for trees with five species, probabilities of splits for all subsets of species can be used to construct the rooted tree as well.


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