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MichaelBishop comments on Eric Drexler on Learning About Everything - Less Wrong
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While it is sometimes useful to say something like genetic variation explains 50% of the variance in trait X, this may often be misleading because of how genes interact with the environment and with each other.
A trait may be immutable at age ten or twenty which was very much undetermined at age two.
Not to mention that heredity is always defined relative to a specific population being measured.
(For instance, giving everybody in a certain area access to high-quality education will reduce environmental variation and thus increase the role that genetic variation plays, pushing up the measured heredity of educational achievement.)