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helenS Multiple studies prove otherwise not just with worms but with all kinds of animals so it looks like similar studies are being replicated and that is the basis of scientific theory. This one study I think is newer but they also have a few older ones dating back. Maybe they'll disprove it somehow but it's looking like it can be replicated.
It's not that genes "directly" affect you, like you don't get born and then remember that your ancestor was chased by a bear but genes make a "mark" (kind of like a chemical influence) and this means that your highly sensitive to this certain "sound" or "stressor." So then the ones who are exposed to that traumatic stimuli are just simply more sensitive (without knowing it) so it ensures survival rates next generations. But at the same time, things not exposed to that certain stimuli has less sensitivity to that certain stressor, almost like it didn't happen to them.
If you look at trauma, putting genetics aside for a moment, all scientists say that your body literally remembers trauma even if you forget it. I suspect the same kind of mechanisms are probably in place.
