Substitution Mutation - A mutation that exchanges one base for another. For this example substitute A with G which will result in this sequence:
GCTGGTCGGCTG
Deletion Mutation - A mutation in which a section of the DNA is cut or lost.
GCTAATCGGCTA -> GCTCGGTA; section AAT was deleted
Insertion Mutation - Extra base pairs are inserted into a new place within the DNA
GCTAATGCGCGGCTA - GCG was added after AAT
Hope this helps!
