Genetic similarities between species are the result of common ancestry
Genetic similarities between species serve as foundational evidence for common ancestry, as shared molecular sequences and conserved genetic pathways reflect descent from shared evolutionary origins.
The retrieved papers consistently support the scientific consensus that genetic and molecular similarities between species are indicative of shared ancestry and evolutionary homology, while noting that distinguishing ancestry from mere chance requires rigorous phylogenetic analysis.
Joaquín Letelier, Silvia Naranjo, Ismael Sospedra-Arrufat, J. Martínez-Morales, J. López-Ríos, N. Shubin, J. Gómez-Skarmeta. The Shh/Gli3 gene regulatory network precedes the origin of paired fins and reveals the deep homology between distal fins and digits. 2020. https://doi.org/10.1073/pnas.2100575118
Paper 2 demonstrates how ancient conserved genetic pathways reflect deep homology and common ancestry across species.
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M. S. Y. Lee. Similarity, parsimony and conjectures of homology: The chelonian shoulder girdle revisited. 1998. https://doi.org/10.1046/j.1420-9101.1998.11030379.x
Paper 4 defines homology as similarity inherited from a common ancestor tested through cladistic analysis.
Avijit Patra, Anjan Mondal, Sayani Banerjee, Harresh Adikesavalu, S. Joardar, T. Abraham. Molecular characterization of Argulus bengalensis and Argulus siamensis (Crustacea: Argulidae) infecting the cultured carps in West Bengal, India using 18S rRNA gene sequences. 2016. https://doi.org/10.22099/MBRC.2016.3752
Paper 5 uses 18S rRNA gene sequences to estimate genetic similarities and establish phylogenetic relationships among species.
Ishani Sharma, Nishant Kumar. Molecular Characterization of Partial Fragment of Keratin Associated Protein (KAP 6.1) Gene in Rambouillet Sheep. 2026. https://doi.org/10.5958/0973-9718.2026.00010.2
Paper 6 explores evolutionary relationships and genetic similarities in keratin-associated protein genes across mammalian species.
Kostas Kampourakis. Genealogical and Genetic Ancestry. 2023. https://doi.org/10.1093/oso/9780197656341.003.0004
Paper 7 notes that DNA tests measure similarity among DNA sequences inherited from common ancestors.
David J. States, Mark S. Boguski. Similarity and Homology. 1995. https://doi.org/10.1093/oso/9780195098747.003.0006
Paper 10 explicitly notes that homology refers specifically to similarity due to descent from a common ancestor.
Theocharis Tsoleridis, Joseph G Chappell, Okechukwu Onianwa, Denise A Marston, Anthony R Fooks, Elodie Monchatre-Leroy, Gérald Umhang, Marcel A Müller, Jan F Drexler, Christian Drosten, Rachael E Tarlinton, Charles P McClure, Edward C Holmes, Jonathan K Ball. Shared Common Ancestry of Rodent Alphacoronaviruses Sampled Globally.. 2019. https://doi.org/10.3390/v11020125
Paper 11 uses genome and phylogenetic analysis of coronaviruses to show that shared genetic features originate from a common ancestor.
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