1. Substitution in DNA and RNA of a pyrimidine for a purine, or vice versa, by mutation. 2. In dentistry, the eruption of a tooth in a position normally occupied by another; transposition of a tooth.
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1) the eruption of a tooth in an abnormal position on the jaw
2) a genetic mutation in RNA or DNA that results from the substitution of a purine base for a pyrimidine base or of a pyrimidine base for a purine base
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trans·ver·sion (trans-vurґzhən) [L. transvertere to turn away] 1. displacement of a tooth from its proper numerical position in the jaw. 2. in molecular genetics, a point mutation in which a purine base replaces a pyrimidine base or vice versa. Cf. transition.Medical dictionary. 2011.