Random Fertilisation and Genetic Variation

Genetic diversity arises due to RANDOM mutation.
Often, due to the degenerate code, mutations result in no impact.
Types of mutations include addition, deletion, and substitution.
The rate of mutations increases by the action of mutagenic agents.
Variation also happens through meiosis processes such as crossing over, random arrangements of chromosomes, and random fertilisation.
The text prompts the question of the importance of variation.