I saw genetic mutators in broker trade. But I want to know how they work and what they do and whether it's customizable, etc. etc.

I have not found any page with information about this, though I've searched the forums and tried clicking on the item's information.

@Chrisclason, Genetic Mutators can be used on captured pets to add either a visible or carried trait (at random) to any slot that has no trait in it already. c:
The most common one is the Lesser Genetic Mutator, which adds any trait possible (as long as the gene/mutation slot of the pet is empty) as either visible or carried at random.
The rarer one is the Greater Genetic Mutator, which costs Diamonds (cash), but lets you pick the trait you want and automatically is visible.

This is good for captured pets that already have a trait already, to add another possible gene or mutation to them that makes them a better pet for breeding or looking good. Hope this helps!

Thank you!