Tautomeric shift is one of the common reasons for point mutation. For example, cytosine is regularly complementary to guanine. But sometimes cytosine can have a tautomeric shift to be in an imino form, and the cytosine in an imino form can be complementary to adenine. When this happens, the T-A base pair would be duplicated to C(imino form)-A pair during the DNA duplication. And if this glitch is not fixed, in one more round of DNA duplication, C can be back to the regular form and pair with G in this position. Eventually, this entire process leads to a______ point mutation

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