In the context of Genetic Mutations, a transversion is a type of point mutation where a single nucleotide base is changed, resulting in the substitution of a purine for a pyrimidine, or vice versa. Specifically, it involves the replacement of adenine (A) with either cytosine (C) or thymine (T), or the substitution of guanine (G) with either cytosine (C) or thymine (T).