transition mutation


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.