As we come to understand how much genetic expression is tied to environmental influences, such as with epigenetics silencing certain genes, all of these genetic

As we come to understand how much genetic expression is tied to environmental influences, such as with epigenetics silencing certain genes, all of these genetics/environment dichotomies are going to become less distinct. We need to talk about them as genetic susceptibility plus environmental trigger. For instance, say the environmental trigger is something extremely common, like the common cold. Even in carefully built twin studies there would be a high likelihood of the trigger occurring, which would make it appear heavily genetically caused, but the genes alone would not be sufficient to cause the condition.