Final answer:
Mutation refers to a change in the DNA or RNA sequence, while the movement of the middle finger is controlled by muscles and tendons.
Step-by-step explanation:
Mutation refers to a change in the sequence of bases in DNA or RNA. It is a process that leads to genetic diversity and plays a crucial role in evolution. Mutations can be beneficial, harmful, or have no significant effect on an organism.
In the context of the question, the middle finger abducts and flexes at the metacarpo-phalangeal joints and extends at the interphalangeal joints. This action is controlled by muscles and tendons, not mutations.
So, in summary, mutations are genetic changes that occur in DNA or RNA, while the movement of the middle finger is a result of muscular contraction and extension.