Inheritance probabilities γ represent the proportion of genes contributed by each parental population to a given hybrid node. This network implies the existence of extinct or unsampled taxa (dotted line). Rooted phylogenetic network with two hybridization events and seven sampled taxa ( A– G). A network can include branch lengths to measure evolutionary time, and an inheritance probability γ for each parent hybrid edge, to measure the proportion of the genome that a hybrid node inherited from each parent ( fig. Hybrid nodes, with two parents, represent ancestral or present-day species who received genetic material from two parental lineages. Networks can explicitly describe various biological processes such as hybridization, introgression, or horizontal transfer. As data accumulate, we predict that the use of phylogenetic networks will grow substantially in future studies of biological and cultural evolution.Ī phylogenetic network is a phylogenetic tree with added hybrid edges ( Huson et al. The finer details of the tree of life can be represented in the “network” of life (but see e.g., Mindell 2013 Morrison 2014, about the tree-vs.-network debate). Molecular sequence data provide detailed insights into the evolutionary history of species and populations, including past reticulation events. Extended Newick, bootstrap, network visualization, introgression, hybridization, gene flow, SNaQ, phylogenetic comparative method Introduction
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