Evolutionary relationships between species are often depicted using a phylogenetic tree. The structure of the tree depends on the species’ genomes. A common method for deducing the tree is to analyze the genomic evolution of particular loci, but under a basic assumption of gene duplication and loss, the tree implied by a single locus’s evolution may not coincide with the species tree. In this presentation, I discuss statistical identifiability of the species tree and consistency of consensus methods for estimating the tree.