But imagine a world in which environment truly was more determining than genes. Every animal born in a swamp would be a frog (no matter what its parents were) and every animal born in a tree would be a bird. Perhaps coloration or some other trait might be heritable — blue birds who move to swamps give rise to little blue tadpoles — but the majority of phenotypic features would be governed by the environment in which the organism is born and develops.
In our world, all we know about X is that it is a phenotypic feature, then we should expect it is more likely to be stable under different environments than to be stable under different genotypes. Features must owe more (on the aggregate) to genes than to environment. If it were otherwise, then we would not talk about species! We know we are not in the swamp-birds-have-tadpoles world.
When people talk about genes vs. environment, they usually aren’t really talking about all features. They’re usually talking about some particular, politically interesting set of features of humans …
Of course.
But imagine a world in which environment truly was more determining than genes. Every animal born in a swamp would be a frog (no matter what its parents were) and every animal born in a tree would be a bird. Perhaps coloration or some other trait might be heritable — blue birds who move to swamps give rise to little blue tadpoles — but the majority of phenotypic features would be governed by the environment in which the organism is born and develops.
In our world, all we know about X is that it is a phenotypic feature, then we should expect it is more likely to be stable under different environments than to be stable under different genotypes. Features must owe more (on the aggregate) to genes than to environment. If it were otherwise, then we would not talk about species! We know we are not in the swamp-birds-have-tadpoles world.
When people talk about genes vs. environment, they usually aren’t really talking about all features. They’re usually talking about some particular, politically interesting set of features of humans …