backmutation
back mutation n.
A reversal process whereby a gene that has undergone mutation returns to its previous state.

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Universalium. 2010.

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  • Haplogroup U (mtDNA) — Haplogroup U Possible time of origin 55,000 BP Possible place of origin Western Asia Ancestor R Descendants U1, U5, U6, U2 3 4 7 8 9 Defining mutations 11467, 12308, 12372 …   Wikipedia

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