#monogenic

adj.

Definition:

relating to or controlled by a single gene (= part of a cell that is passed on by your parents and that controls physical development, behaviour, etc.)

Example usage:

There are several monogenic conditions for which there is a genetic test available.

1) This ends up being a pretty nice story (if you stay until the end).

Holomorphic, a. /hol’ō-mōr’fik/ - Said of a function which is monogenic, uniform, and continuous.   

Monogenic, adj. /mänōˈjenik/ - Originating from a single source; involving or controlled by a single gene.