Root location in random trees: A polarity property of all sampling consistent phylogenetic models except one

Details Root location in random trees: A polarity property of all sampling consistent phylogenetic models except one Root location in random trees: A polarity property of all sampling consistent phylogenetic models except one

2012-03-26

arxiv.org/abs/1203.5835v1

Biology

Quantitative Biology

Populations and Evolution

8 pages, 1 figure

Scientific paper

Neutral macroevolutionary models, such as the Yule model, give rise to a probability distribution on the set of discrete rooted binary trees over a given leaf set. Such models can provide a signal as to the approximate location of the root when only the unrooted phylogenetic tree is known, and this signal becomes relatively more significant as the number of leaves grows. In this short note, we show that among models that treat all taxa equally, and are sampling consistent (i.e. the distribution on trees is not affected by taxa yet to be included), all such models, except one, convey some information as to the location of the ancestral root in an unrooted tree.

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