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Updated: Oct 11, 2025

Detection of Homologous Recombination Intermediates via Proximity Ligation and Quantitative PCR in Saccharomyces cerevisiae
Published on: September 11, 2022
Homology and errors
Andrew V Z Brower1, Mario C C de Pinna1
1Evolution and Ecology Group, Department of Biology, Middle Tennessee State University, Murfreesboro, TN 37132, USA.
This study critiques the concept of homology in cladistics, clarifying its link to synapomorphy and shared evolutionary history. It defends primary and secondary homology as valid discovery procedures in comparative biology.
Area of Science:
- Systematic Biology
- Evolutionary Biology
- Phylogenetics
Background:
- The concept of homology is central to cladistics and phylogenetic inference.
- Historical interpretations of homology have varied, impacting its application in systematics.
- Recent reviews require critical examination against the historical literature.
Purpose of the Study:
- To critique a recent review of the homology concept in cladistics.
- To re-evaluate the relationship between homology, synapomorphy, and symplesiomorphy.
- To defend the utility of primary and secondary homology in comparative biology.
Main Methods:
- Analysis of historical literature on homology.
- Critique of contemporary interpretations of homology in cladistics.
- Examination of character-state optimization methods, including Direct Optimization.
Main Results:
- Homology remains equivalent to synapomorphy for recognizing clades.
- Symplesiomorphies can be homologies (synapomorphies of inclusive taxa) or not.
- Undirected character-state change is necessary but not sufficient for homology testing.
Conclusions:
- Primary and secondary homology are defended as realistic discovery procedures.
- The epistemological link between homology (evidence) and common ancestry (explanation) is re-emphasized.
- An alternative definition of homology is proposed.
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