transition mutation

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tran·si·tion mu·ta·tion

a point mutation involving substitution of one base-pair for another, that is, replacement of one purine for another and of one pyrimidine for another pyrimidine without change in the purine-pyrimidine orientation.

tran·si·tion mu·ta·tion

(tran-zish'ŭn myū-tā'shŭn)
A point mutation involving substitution of one base pair for another, i.e., replacement of one purine for another and of one pyrimidine for another pyrimidine without change in the purine-pyrimidine orientation.
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