A mutation is a change in DNA base sequence.
There are 4 different types of DNA bases.
Mutations are due to: internal or external factors.
DNA mutations can be HARMFUL, HELPFUL, or NEUTRAL, but they happen randomly.
There are 3 types of DNA mutations:
1.Base Substitution (MedlinePlus).
(MedlinePlus).
Base insertion and base deletion have the highest potential to be dangerous (MedlinePlus)!