In a mutational event,when adenine is replace | vedclass

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(B) point mutation involves a change in a single base pair of $DNA$.Transitions occur when a purine is replaced by another purine $(A \leftrightarrow

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(B) point mutation involves a change in a single base pair of $DNA$.Transitions occur when a purine is replaced by another purine $(A \leftrightarrow G)$ or a pyrimidine is replaced by another pyrimidine $(C \leftrightarrow T)$.Since adenine $(A)$ and guanine $(G)$ are both purines,the replacement of adenine by guanine is a type of transition mutation.Transversion occurs when a purine is replaced by a pyrimidine or vice versa.

Column-$I$	Column-$II$
$(1)$ Lethal mutation	$(a)$ Mutation caused by external factors
$(2)$ Spontaneous mutation	$(b)$ They are metabolic errors
$(3)$ Induced mutation	$(c)$ As a result the mutant dies
$(4)$ Biochemical mutation	$(d)$ Most of the mutations occurring in nature are of this type

In a mutational event,when adenine is replaced by guanine,it is called:

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