Answer:
The mutation will become more common in offspring and increase the genetic variability in the gene pool.
Explanation:
If the mutation is beneficial to the organism and this organism breeds its offspring may carry this gene, if it´s really beneficial and for example makes an organism to have more access to females the mutation may spread faster.
The only way for a mutation to spread to other organisms is reproduction (eukaryotes)
A mutation may also spread to other organisms in prokaryotes in which bacteria may take plasmids (DNA fragments) from the environment.