Adaptive traits might ideally be passed down for two generations to remain relevant to environmental changes within a human lifespan.

“I would want an adaptive trait to be passed for two generations, because given how long our species lives, and certainly given the way the world looks now, as opposed to the previous century or the turn of the previous century, different stressors, different adaptation, different life environments, and what I would want to pass on to my offspring, I can basically hedge pretty well.”