2016/10/11 by Yue Zhang, Zhang, Yue
Biochemistry, Genetics and Molecular Biology · Earth and Planetary Sciences · #Evolution and Paleontology Studies #FOS: Biological sciences #Genetic diversity and population structure #Genomics and Phylogenetic Studies #Populations and Evolution (q-bio.PE) #Quantitative Methods (q-bio.QM)
paper · pdf · doi:10.48550/arxiv.1610.03217
openalex publication_date 2016/10/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In phylogenetic analysis, for non-molecular data, particularly morphology, parsimony optimization is the most commonly employed approach. In the past and present application of the parsimony principle, extra step numbers have been added across different characters without proper justification. This practice, however, has caused the impacts of characters to be inflated or deflated without a valid reason. To resolve this methodological deficiency, here I present a corrected parsimony criterion for reconstructing phylogenies. In essence, character rather than step is the most fundamental unit. Accordingly, the most parsimonious tree should maximize the sum or average of the phylogenetic signals, quantified by retention index, contributed by each character. Assigning proper weights to characters is a separate task that requires information other than the intra-character step number changing range.