Base-pair substitutions in which the purine in one strand of DNA is replaced with a different purine,and the pyrimidine in the complementary strand is replaced with a different pyrimidine are known as:

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Transitions are base-pair substitutions where a purine is replaced with another purine (A ↔ G) or a pyrimidine is replaced with another pyrimidine (C ↔ T). This type of mutation maintains the purine-pyrimidine pairing, which is less disruptive to the DNA structure than transversions.

Base-Pair Substitutions in Which the Purine in One Strand of DNA