<prompt> Transition mutation of GATCCT is: PGI Dec 2006GGTCCTGTTCCTGTCCCTGGUGGT  <response>: Ans: A GGTCCT In Transition type of mutation, a purine base is replaced by another purine base A-G or a pyrimidine is replaced by another pyrimidine C-T.So-Transition of -GATCCT is GGTCCT only single base is changed, according to options given, it the only answer 