MugaSofer comments on The Psychological Unity of Humankind - Less Wrong
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That sounds like exactly the kind of situation Eliezer claims as the exception - the adaptation is present in the entire population, but only expressed in a subset based on the environmental conditions during development, because there's a specific advantage to polymorphism.
Those are single genes, not complex adaptations consisting of multiple mutually-dependant genes. Exactly the "froth" he describes.