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Because mutual selectivity, reactivity, and constraint take place only in actual processes, it is these that orchestrate the activity of different portions of the DNA, that make genetic and environmental influences interdependent as genes and gene products are environment to each other, as extraorganismic environment is made internal by psychological or biochemical assimilation, as internal state is externalized through products and behavior that select and organize the surrounding world.
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Susan Oyama (The Ontogeny of Information: Developmental Systems and Evolution (Science and Cultural Theory))