Phylogeny | Construct/Test UPGMA Tree
This command is used to construct a UPGMA tree. This tree-making method assumes that the rate of evolution has remained constant throughout the evolutionary history of the included taxa. Therefore, it produces a rooted tree.
If your input data is a distance matrix, then using this command makes MEGA proceed directly to constructing and displaying the UPGMA tree. In all other instances, you will be asked in an Analysis Preferences dialog box to specify the distance estimation method, subset of sites to include, and whether to conduct a test of the inferred tree.