“An important consequence of the unique interaction between internal and external forces … is that knowledge of genetic differences contains no information at all about whether a characteristic can be changed by environmental and social arrangements. The most elementary error about genetics and development is to suppose that “genetic” is the opposite of “changeable” and that an answer to the question “how much can a trait be changed by social, historical, and individual circumstances” is given by an answer to the question “how important are genes.””

—  Richard C. Lewontin

Genes and Sexuality: An Exchange (1995)

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Richard C. Lewontin14
American evolutionary biologist 1929

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“[T]he psychic and physical characteristics of human beings, and the differences between individuals, are the consequence of an interaction between the genes that are present in the fertilized egg and the sequence of environmental circumstances that the developing organism experiences during its entire life history. With a few exceptions, like cystic fibrosis where possession of the defective genotype leads ineluctably to the disease, or language acquisition where the language spoken depends only on experience and not at all on genotype, human characteristics are all subject to this interaction of forces. There are, moreover, random events in cell growth and differentiation that are neither genetic nor environmental in the usual sense, and which play an extremely important part in development, especially in behavioral traits.”

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“Genetics is the study of similarity between relatives, and the problem of human genetics is that, in a species with a family and social structure and a taboo against manipulating individual life histories experimentally, there is a confounding between the similarity of relatives that arises from biological causes and the similarity that arise from social causes.”

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“This interaction of genetic and external influences makes my behaviour unpredictable, but not undetermined.”

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“Beyond that, however, genetic messages are coded in such a way that there is a constant give-and-take between those messages and the present experience of any given individual. That is, no genetic event is inevitable.”

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“There are two important factors to consider in the emergence of social change. One is that a society develops through changes in its institutions, which are blends of culture and genetically shaped social behavior. The other is that the genes and culture interact. This may seem paradoxical to anyone who considers genes and culture to be entirely separate realms. But it is scarcely surprising from an evolutionary perspective, given that the genome is designed to respond to the environment, and a major component of the human environment is society and its cultural practices.”

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“The genetic expression within any given cell at any given time is not “fixed,” as many people think it is. It is not a static thing. Rather, it is continually adapting to both external and internal stimuli – meaning that it adjusts to the environment and to any changes in the surroundings, as well as to any changes within the body itself.”

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“Genetic determinism… On its interpretation depends the entire relation between biology and the social sciences.”

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“IQ is a genetic given that cannot be changed by life experience, and that our destiny in life is largely fixed by these aptitudes.”

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“Coherence and harmony in relations and interactions between the members of a human social system are due to the coherence and harmony of their growth in it, in an ongoing social learning which their own social ( linguistic) operation defines and which is possible thanks to the genetic and ontogenetic processes that permit structural plasticity of the members.”

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Source: The tree of Knowledge (1987), p. 199 as cited in: Vincent Kenny (1989) " Life, the Multiverse and Everything; an Introduction to the Ideas of. Humberto Maturana http://www.oikos.org/vinclife.htm".

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