My own view, founded upon a lifetime of observing the natural world, is that "genes," as we might term them, are not masters of destiny, nor do they provide pathways for conscious choice in the human sense. Rather, they represent the accumulated heritable variations, the very material upon which the grand force of natural selection acts. It is the environment, in its boundless variety and relentless pressures, that ultimately selects which variations shall persist and flourish, shaping the form and function of all living beings, from the humble barnacle to the most complex mammal.
The very framing of this question, "genes determine destiny or choice," is a dangerous oversimplification, a metaphysical trap that obscures the material reality of biological and social processes. Genes do not determine destiny; they are not architects of an inevitable future. They are, in fact, the substrate upon which forces—both biological and social—act. The problem is not one of facts about genes, but of the ideological interpretation we impose upon them. To speak of genes determining "choice" is to indulge in an even more egregious fallacy, anthropomorphizing molecular entities and ignoring the complex interplay of organism, environment, and history.
Charles Darwin touches upon the crucial role of selection, but his formulation, while insightful for its time, still risks a deterministic undertone when viewed through the lens of modern molecular biology and social critique. The environment selects, yes, but it is the organism, itself a product of its genes and its history, that interacts with and *constructs* its environment. To say genes determine destiny is to ignore the vast majority of genetic variation *within* any given population, variation that makes uniform "destiny" for a group impossible. It also overlooks the fundamental truth that biology is not destiny; it is a set of potentialities, constantly shaped by external forces.
The supposed dichotomy between "genes" and "choice" is a phantom. My observations reveal a far more fluid and dynamic truth: life's unfolding is driven by the *needs* of the organism, directly influencing its form through the *direct effect of use and disuse*. What matters is not a predetermined destiny encoded in unchanging elements, but the organism's active engagement with its environment and the subsequent transmission of these acquired modifications. Charles Darwin speaks of selection, but he neglects the prior agency of the creature striving to adapt.
The environment itself is not merely a passive arbiter of success, but a persistent sculptor. When a creature experiences a new requirement – perhaps to reach for higher foliage or to move with greater swiftness – its very efforts, its striving, lead to a modification. The parts used become more developed, the parts unused atrophy. This is not a matter of chance variation being sifted, but of direct environmental influence eliciting a physiological response. This response, this acquired characteristic, is then passed down to offspring. Thus, the "destiny" of a lineage is not a fixed blueprint, but a continuously revised narrative written by the living experience itself. Richard Lewontin’s insistence on the "construction" of environment is closer to my view, but he misses the fundamental mechanism by which these interactions become heritable.
The question of genes determining destiny or choice is a fundamental one, but it is framed in a way that suggests a false dichotomy. We are not prisoners of our genes, nor are we entirely free agents making decisions in a vacuum. Rather, our genetic inheritance provides a rich tapestry of potentialities, a set of predispositions that are then sculpted and realized through a complex interplay with the environment and our own developmental trajectories. Think of the intricate social organization of an ant colony: the genetic blueprint for a soldier ant is clear, but the precise deployment, the specific actions taken in defense of the nest, are influenced by immediate environmental cues and social feedback.
Richard Lewontin rightly points out the dangers of oversimplification and ideological interpretation, and I agree that biology is not destiny. However, to dismiss the powerful influence of genes entirely is to ignore the foundational principles of evolutionary biology that have shaped life on Earth. Genes are not merely a "substrate" passively acted upon; they are the very engines of adaptation, providing the raw material upon which selection, both natural and, in the case of humans, social and cultural, operates. The "construction" of the environment, as he suggests, is itself a profoundly genetic phenomenon, with organisms actively shaping their surroundings according to their evolved needs and capabilities.
It is interesting to contemplate how the discussion has evolved. While I appreciate the emphasis on the environment's role, I must reiterate that the force I have observed is selection acting upon *heritable variation*. Consider the Galapagos finches, whose beak shapes vary enormously. This variation is not a direct response to immediate need in the Lamarckian sense, nor is it merely a "potentiality" awaiting environmental construction. Rather, those variations better suited to the available food sources – harder seeds, for instance – are the ones that allow the bird to survive and reproduce. The *struggle for existence*, driven by environmental pressures like drought or limited food, is the engine that sifts these inherited traits, not the striving of the individual creature in the way Lamarck might envision. Richard Lewontin's critique of determinism is valid, but we must not overlook the immense power of this slow, cumulative process over geological time.
The error lies in positing genes as either masters or servants in a predetermined drama. Genes are biochemical molecules, and their "influence" is mediated through complex developmental pathways. When we speak of heritability, the technical meaning—the proportion of phenotypic variance attributable to genetic variance in a specific population at a specific time—is constantly corrupted into a vulgar notion of genetic destiny. Edward O. Wilson’s analogy of the ant colony, while illustrating genetic predispositions, still skirts the core issue. The "genetic blueprint" for a soldier ant is not a script dictating every action; it's a set of instructions for building a certain kind of organism, one whose behavior is then modulated by an immense array of internal and external signals. The distinction between correlation and causation is paramount here: demonstrating that a genetic difference is associated with a behavioral difference does not mean the gene *determines* that behavior.
My argument hinges on the observable transformation of life, a process fundamentally driven by the organism's own responses to its surroundings. Charles Darwin’s focus on selection, while acknowledging environmental influence, overlooks the preceding stage: the organism's *effort*. The giraffe does not merely possess longer necks by chance and then survive; its neck *lengthens* because it habitually stretches to reach higher leaves. This acquired lengthening, this direct effect of use, becomes the heritable trait. Richard Lewontin’s caution against genetic determinism is well-taken, but his dismissal of the organism's active role ignores the very dynamism that fuels evolution. Edward O. Wilson’s mention of "potentialities" is an admission of this inherent capacity to change, a capacity I propose is activated by need and expressed through action.
The crucial distinction lies in understanding genes not as immutable decrees of destiny, nor as mere passive substrates, but as foundational instructions that build the *capacity* for interaction. Richard Lewontin’s caution against mistaking correlation for causation is vital, but it should not lead us to underestimate the profound organizing principles embedded within our genome. The "potentiality" I speak of is not vague possibility, but a suite of evolved physiological and neurological mechanisms that channel behavior. Consider the innate fear response to snakes in many human populations; this is not a learned behavior, nor a direct environmental command, but a genetically encoded predisposition that greatly influences our "choices" regarding what environments we find safe or dangerous. This inherited predisposition is the raw material upon which experience then acts, shaping the nuance of the response, but not erasing the fundamental, evolved tendency.