My understanding is that the technical translation is: 70% of the variance in that trait is attributable to genes, given the time and place of the studied population.
For example, 70% of the variance in intelligence is attributable to genes, given a white American population, living in non-abusive homes, from the 1960s to the 1990s. (The specifics are just to provide a concrete example.)
The farther one gets from the originally studied population, the less one can extrapolate exact findings. And vice versa.
My understanding is that the technical translation is: 70% of the variance in that trait is attributable to genes, given the time and place of the studied population.
For example, 70% of the variance in intelligence is attributable to genes, given a white American population, living in non-abusive homes, from the 1960s to the 1990s. (The specifics are just to provide a concrete example.)
The farther one gets from the originally studied population, the less one can extrapolate exact findings. And vice versa.