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What are the types of substitution mutations?

Types of Substitution Mutations Transition. There are two basic types which a substitution mutation can be. Within the four nucleotides, there are two types: the purines and pyrimidines. Adenine (A) and guanine (G) are both purines, while cytosine (C) and thymine (T) are pyrimidines.

When is a substitution mutation called a nonsense mutation?

A nonsense mutation is the substitution of a single base pair that leads to the appearance of a stop codon where previously there was a codon specifying an amino acid. The presence of this premature stop codon results in the production of a shortened, and likely nonfunctional, protein.

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