knndknekrn
The mean of prefixes for beneficial is "having a good effect or favorable result."
effect
Well, there is no specific type of mutation that is beneficial. They can be harmful, helpful, or have no effect at all.
depends on what you mean by beneficial :/
Good nutrition
Extremely rich soil for farming.
testing
Buoyancy
It is an indication that there the clinical effect is negligible.
helpful
The root "bene" means "good" or "well." It is commonly used in words like benevolent (showing kindness) and beneficial (having a good effect).