Tag ctt ggc at what kind of mutation is this?

Point mutation

Explanation:

This kind of mutation is the change of one nucleotide in a sequence. The mutation causes a change in the translated amino acid at this position. If the change results in a codon that codes for the same amino acid, then there is no effect. However, a different amino acid may change the properties/characteristics of the translated protein causing some effect on the phenotype of the organism bearing the mutation.