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Activity Number:
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141
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Type:
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Topic Contributed
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Date/Time:
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Monday, July 30, 2007 : 10:30 AM to 12:30 PM
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Sponsor:
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IMS
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| Abstract - #309395 |
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Title:
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Bayes Estimation of Hybridization in Species Phylogeny Based on Incongruent Gene Topologies
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Author(s):
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Chen Meng*+
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Companies:
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University of New Mexico
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Address:
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521 Spruce St SE Apt 308, Albuquerque, NM, 87106,
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Keywords:
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phylogenetics ; hybridization ; coalescence ; Bayesian
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Abstract:
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Evolutionary inference via phylogenetic trees has been increasingly performed on DNA sequence data from multiple genes for a set of organisms. Both incomplete lineage sorting and hybridization (gene flow between distinct species) may cause topological incongruence between species tree and gene trees. We develop a model that assumes independent evolution across genes and allows both deep coalescence and hybridization. Frequentist tests and Bayesian approaches are used to detect hybrid speciation. The Bayesian method incorporates prior knowledge about hybridization. An MCMC algorithm is implemented to estimate the proportion of the genes that are derived from each parental species under the model and to determine which factor (hybridization or coalescence) is primarily responsible for variation in individual gene histories. We apply the method to simulated and real data.
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- The address information is for the authors that have a + after their name.
- Authors who are presenting talks have a * after their name.
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