In biology, phylogenetic trees represent the evolutionary history and diversification of species -- the ''family tree'' of Life. Phylogenetic trees not only describe the evolution of a group of ...

The new model focuses on phylogenetic diversity, which is very different from counting species, today's standard measure of biodiversity. The same number of species (three blue circles) can have a ...

Play NOVA's Evolution Lab to explore the tree of life and become an expert in phylogenetics—the study of the evolutionary relationships among species. Receive emails about upcoming NOVA programs and ...

Read me first! -- Tutorial : estimate a tree! -- Acquiring -- Aligning the sequences -- Major methods for estimating phylogenetic trees -- Neighbor-joining trees -- Drawing phylogenetic trees -- ...

Download a 1-page "how-to" doc on hand-building UPGMA and neighbor-joining trees. Download an Excel spreadsheet showing how to build UPGMA, Fitch-Margoliash or Neighbor-joining trees by hand For the ...