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1. Biogenetic law (recapitulation theory, "ontogeny recapitulates phylogeny")
The theory that " ontogeny recapitulates phylogeny ," which means that one can trace the evolutionary development of a species by studying the development of an individual embryo or young of that species. The theory is still used, especially in paleontology , but has been found to not be strictly true when applied to problems in biology .
Pertaining to a phylogeny.
3. Phylogeny (phylogenesis, phylogenetic, phylogenic)
The evolutionary history of a particular taxonomic group, usually a species.
1) the study of evolutionary relationships within a monophyletic group. 2) evolutionary hypotheses represented as a dendrogram or branching diagram.