In terms of origin or development.
"The success of the new company was genetically tied to its founder's early vision and relentless work ethic."
In plain English: Genetically means something is determined by your DNA instead of how you were raised or what happened to you later in life.
"Many diseases run in families because they are inherited genetically from parents to children."
The word genetically comes from combining the root genetic with the suffix -ally to form an adverb. It entered English by modifying the existing adjective genetic to describe actions done in a manner related to genes.