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Stephen Jay Gould

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Sociobiology is not just any statement that biology, genetics, and evolutionary theory have something to do with human behavior. Sociobiology is a specific theory about the nature of genetic and evolutionary input into human behavior. It rests upon the view that natural selection is a virtually omnipotent architect, constructing organisms part by part as best solutions to problems of life in local environments. It fragments organisms into “traits,” explains their existence as a set of best solutions, and argues that each trait is a product of natural selection operating “for” the form or behavior in question. Applied to humans, it must view specific behaviors (not just general potentials) as adaptations built by natural selection and rooted in genetic determinants, for natural selection is a theory of genetic change. Thus, we are presented with unproved and unprovable speculations about the adaptive and genetic basis of specific human behaviors: why some (or all) people are aggressive, xenophobic, religious, acquisitive, or homosexual.
--
"Our Natural Place", p. 243

 
Stephen Jay Gould

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Zoocentrism is the primary fallacy of human sociobiology, for this view of human behavior rests on the argument that if the actions of "lower" animals with simple nervous systems arise as genetic products of natural selection, then human behavior should have a similar basis.

 
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Independent derivation meshed beautifully with the triumph, from the 1930's on, of a strict version of Darwinism based on the near ubiquity of adaptive design built by natural selection... Arthropods and vertebrates do share several features of functional design. But those similarities only reflect the power of natural selection to craft optimal structures independently in a world of limited biomechanical solutions to common functional problems - an evolutionary phenomenon called convergence.

 
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We do not inhabit a perfected world where natural selection ruthlessly scrutinizes all organic structures and then molds them for optimal utility. Organisms inherit a body form and a style of embryonic development; these impose constraints upon future change and adaptation. In many cases, evolutionary pathways reflect inherited patterns more than current environmental demands. These inheritances constrain, but they also provide opportunity. A potentially minor genetic change […] entails a host of complex, nonadaptive consequences. […] What “play” would evolution have if each structure were built for a restricted purpose and could be used for nothing else? How could humans learn to write if our brain had not evolved for hunting, social cohesion, or whatever, and could not transcend the adaptive boundaries of its original purpose?

 
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"Social and cultural factors very broadly channel and limit sexual variation in human populations. Sexual laws, codes, and roles do restrict the range and intensity of sexual practices, as far as we can judge from the cross-cultural literature (Herdt and Stoller 1990). Kinsey lent his support to this view; Ford and Beach (1950) documented it in surveys; and Margaret Mead (1961) did so in her ethnographic studies. But biosocial, genetic, and hormonal predispositions also broadly limit and channel. Each culture's theory of the combination of these social and biological constraints we could call its theory of human sexual nature. Yet none of these broad principles, nor the local theory of human sexual nature, entirely explains or predicts a particular person's sexual desires or behaviors. A sexual behavior, that is, does not necessarily indicate an erotic orientation, preference, or desire. The homosexual is not the same as the homoerotic; whether in our society or one very exotic, I will claim, we can distinguish the homosexual from the homoerotic, as Oscar Wilde's case first hinted."

 
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Throughout his last half-dozen books, for example, Arthur Koestler has been conducting a campaign against his own misunderstanding of Darwinism. He hopes to find some ordering force, constraining evolution to certain directions and overriding the influence of natural selection. […] Darwinism is not the theory of capricious change that Koestler imagines. Random variation may be the raw material of change, but natural selection builds good design by rejecting most variants while accepting and accumulating the few that improve adaptation to local environments.

 
Stephen Jay Gould
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