Phylogenetics:
In biology, phylogenetics is the study of evolutionary relationships among groups of organisms. A phylogenetic tree or evolutionary tree is a branching diagram or “tree” showing the inferred evolutionary relationships among various biological species or other entities based upon similarities and differences in their physical and/or genetic characteristics.
Ontogenetics:
The origin and development of an individual organism from embryo to adult. Also called ontogenesis; the entire sequence of events involved in the development of an individual organism.