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the claim

The genetic code is universal across all organisms.

the verdict
REFUTED
the evidence says no
Recorded sources
2 sources for · 4 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that the genetic code is universal across all organisms?

No. Multiple reference and peer-reviewed sources state the genetic code is not universal: variant codes occur in mitochondria and some nuclear genomes, and one review explicitly concludes it is not universal. Two other sources describe the code as only 'nearly' universal or sharing fundamental rules, which concedes exceptions.

Verdict: REFUTED · 2 sources for, 4 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 2
The Standard Genetic Code Predominantly Assigns Uracil-Containing Codons to Amino Acids Enriched in Transmembrane Domains and Uracil-Free Codons to Amino Acids Enriched in Intrinsically Disordered Regions
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The Standard Genetic Code Predominantly Assigns Uracil-Containing Codons to Amino Acids Enriched in Transmembrane Domains and Uracil-Free Codons to Amino Acids Enriched in Intrinsically Disordered Regions. (n.d.). cir.nii.ac.jp. https://doi.org/10.51094/jxiv.592

Evidence against · 4
Genetic code
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Genetic code. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Genetic_code

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More for · 1
Sampling informational properties of codon usage through the tree of life.
2025
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Martínez, O., Reyes-Valdés, M. H., & Ochoa-Alejo, N. (2025). Sampling informational properties of codon usage through the tree of life.. doi.org. https://doi.org/10.1371/journal.pone.0335824

More against · 3
Evolving genetic code.
2008
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Ohama, T., Inagaki, Y., Bessho, Y., & Osawa, S. (2008). Evolving genetic code.. doi.org. https://doi.org/10.2183/pjab.84.58

Why is the genetic code so heavily conserved?
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Why is the genetic code so heavily conserved?. (n.d.). biology.stackexchange.com. https://biology.stackexchange.com/questions/105612

Will a Codon result in same amino acid across organisms
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Will a Codon result in same amino acid across organisms. (n.d.). biology.stackexchange.com. https://biology.stackexchange.com/questions/52748

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