The mutation<span> caused by the addition of a nucleotide to an already existing gene sequence is duplication.</span>
Answer:

Explanation:
Cerebellum is a leaf-like structure that is a part of the hind brain and is responsible for:
- coordinating skeletal muscle movements.
- controls movements, posture and balance.
- involved in learning too.
So, if the cerebellum of the brain is affected/injured, a person can have difficulty in keeping their body in a balanced position, coordinate voluntary movements of skeletal muscles and learning.
![\rule[225]{225}{2}](https://tex.z-dn.net/?f=%5Crule%5B225%5D%7B225%7D%7B2%7D)
Hope this helped!
<h3>~AH1807</h3>
A long reflexive pathway has an advantage over a short reflexive pathway in the fact that they can be also be stimulated by the central nervous system, whereas the short reflexive pathway is only stimulated by the enteric nervous system.