3.31 understand that many mutations are harmful but some are neutral and a few are beneficial

Most mutations are harmful. For example...

- If a mutation occurs in reproductive cells, the offspring might develop abnormally or die
- If a mutation occurs in body cells, the mutated cell may start to uncontrollable divide and become a cancerous tumour.

Some mutations are neither harmful nor beneficial. For example...

- If a mutation occurs in an unimportant part if the DNA it will not affect the person/animal/plant.

Some mutations can be beneficial also. For example, it may increase the chances of survival for that particular animal, this is natural selection.

Example source: CGP