This link is to a rather interesting article on a genetic discovery on "danger avoidance". It specifically relates to a biologically based hazard being encoded -- but it made me wonder if a purely situational hazard would have the same effect.
Anyway, if I am reading this correctly the encoding lasts for four generations until it disappears.
It makes for an interesting read and I thought some might find it worth the time.
Interesting indeed. Although only applies to worms, at least in this study. The Russian "scientist" Trofim Lysenko claimed that all living things could pass on information that they learned to their descendants, including humans. It was the official Soviet policy from the late 1920's until 1964 or so. But there was never any evidence to support the claim and even the Soviets finally gave it up.
Human abilities do at times seem to be DNA traits, so that certain talents or lack thereof can seem to run in families. But, if true, that would be because the people have a built-in aptitude for certain things. Our DNA is made up of 4 chemicals (called "bases") and we have about 3 billion base set in each strand of DNA. Incredibly complex. But natural selection seems to be the main driver of diversity in humans rather than personal experience.
The story I heard a long time ago about Lysenko was that he attended a meeting of biologists who were very critical of his claims.
After they all spoke, Lysenko stood up and announced, "Comrades, the Central Committee of the Communist Party agrees with ME."
Soviet scientists who refused to renounce genetics were dismissed from their posts and left destitute. Hundreds if not thousands of others were imprisoned. Several were sentenced to death as enemies of the state, including the botanist Nikolai Vavilov. Scientific dissent from Lysenko's theories of environmentally acquired inheritance was formally outlawed in the Soviet Union in 1948.