mismatch of bases

mismatch of bases

the noncomplementary pairing of nucleotide bases in a DNA molecule, perhaps following on from a SUBSTITUTION MUTATION event. The error may be corrected at the next replication of the DNA molecule, producing one mutant and one normal molecule.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005