Phylogenetics is the study of the evolutionary relatedness among groups of organisms. Molecular phylogenetics uses sequence data to infer these relationships for both organisms and the genes they maintain Phylogenetics is important because it enriches our understanding of how genes, genomes, species (and molecular sequences more generally) evolve.In biology, phylogenetics is a part of systematics that addresses the inference of the evolutionary history and relationships among or within groups of organisms.Phylogenetics is the study of the evolutionary relatedness among groups of organisms. Molecular phylogenetics uses sequence data to infer these relationships for both organisms and the genes they maintain.Phylogenetic trees come about through successive events of speciation (branching), in which one species gives rise to two. “Phylogenetic relationship” refers to the relative times in the past that species shared common ancestors.Phylogenetic classification system is based on the evolutionary ancestry. ... It generates trees called cladograms, which are groups of organisms that include an ancestor species and its descendants. Classifying organisms on the basis of descent from a common ancestor is called phylogenetic classification.In a phylogenetic tree, the species of interest are shown at the tips of the tree's branches. The branches themselves connect up in a way that represents the evolutionary history of the species—that is, how we think they evolved from a common ancestor through a series of divergence (splitting-in-two) events.