Transition type of gene mutation is caused wh | vedclass

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(D) In transition mutation,a nitrogenous base is replaced by another base of the same chemical category. This means a purine is replaced by another pu

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$AT$ is replaced by $GC$

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(D) In transition mutation,a nitrogenous base is replaced by another base of the same chemical category. This means a purine is replaced by another purine $(A \rightleftharpoons G)$ or a pyrimidine is replaced by another pyrimidine $(C \rightleftharpoons T)$. In option $(d)$,$AT$ ($A$ is a purine,$T$ is a pyrimidine) is replaced by $GC$ ($G$ is a purine,$C$ is a pyrimidine). Specifically,$A$ is replaced by $G$ (purine to purine) and $T$ is replaced by $C$ (pyrimidine to pyrimidine),which fits the definition of a transition.

Transition type of gene mutation is caused when

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