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Identical twins have exactly the same DNA throughout their lives.
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REFUTED
the evidence says no
Recorded sources
2 sources for · 8 against
Is it true that identical twins have exactly the same DNA throughout their lives?
No. Multiple sources indicate monozygotic twins are not exactly identical in DNA: they accumulate early replication mutations and epigenetic differences, and genomic analyses have detected discordance between twin genomes. A few sources assert twins have the same DNA, but these do not address lifelong constancy.
Verdict: REFUTED · 2 sources for, 8 against · Last checked
Evidence for · 2
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Amrit & Rabindra Singh. (2006). escholarship.org. https://escholarship.org/uc/item/8w02f6fw
Evidence against · 8
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Are identical twins exactly the same?. (2013). biology.stackexchange.com. https://biology.stackexchange.com/questions/10544/are-identical-twins-exactly-the-same
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More for · 1
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Experimental research to verify the effect of targeted drugs in epigenetic cancers. (2026). doi.org. https://doi.org/10.61173/23a0v041
More against · 7
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News: Identical twins are not so identical,... (The Guardian) - Behind the headlines - NLMTwitterFacebookLinkedInGitHubTwitterSM-FacebookSM-Youtube. (n.d.). ncbi.nlm.nih.gov. https://www.ncbi.nlm.nih.gov/search/research-news/12660/
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mtDNA Heteroplasmy in Monozygotic Twins Discordant for Schizophrenia. (n.d.). cir.nii.ac.jp. https://doi.org/10.1007/s12035-016-9996-x
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Spontaneous event of mitochondrial DNA mutation, A3243G, found in a family of identical twins. (n.d.). cir.nii.ac.jp. https://doi.org/10.3109/19401736.2012.731402
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Environmental Factor Index (EFI): A Novel Approach to Measure the Strength of Environmental Influence on DNA Methylation in Identical Twins. (n.d.). cir.nii.ac.jp. https://doi.org/10.3390/epigenomes8040044
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Michiko, I. & Hiroshi, K. (2007). Brief Report: Identical Male Twins Concordant for Asperger's Disorder. eric.ed.gov. https://doi.org/10.1007/s10803-006-0150-x
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Pattern of Different Types of Fingerprints amongst the Community- an Observational Cross Sectional Study. (2020). doi.org. https://doi.org/10.46858/vimshsj.7202
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Genomic Discordance Between Monozygotic Twins Discordant for Schizophrenia. (n.d.). cir.nii.ac.jp. https://doi.org/10.1176/ajp.155.3.422
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