The current triggers can change in a single generation…
The current triggers can change in a single generation, even though it would take many generations for genetic evolution to alter the design of the module and its original triggers.
— from Who Is Flying (Self, Nature & Nurture)
In the book
The first act of wisdom is simply to learn that airframe honestly — to discover your own nature, and contend with it, before you can ever make peace with yourself. There is freedom in this, not defeat, because your inherited tendencies are not a life sentence: the very triggers that activate them can change within a single generation, even though the genes themselves take many. The airframe is fixed; what you do at the controls is not. — Who Is Flying (Self, Nature & Nurture)