The Selfish Gene
Richard Dawkins · 1976
"Natural selection is best understood as operating at the level of the gene, not the individual or the species — organisms are best thought of as survival machines built by genes to make more copies of themselves."
Dawkins reframed a century of evolutionary biology around one shift in perspective: stop asking what's good for the animal, and ask what's good for the gene riding inside it. Everything else follows.
Dawkins argued that genes, not individuals or groups, are the real unit that natural selection acts on and that persists across generations — an individual organism is a temporary vehicle, but a gene (or more precisely, an allele) can persist, in copies, indefinitely. This reframing explained behaviors that looked paradoxical under individual- or group-selection models, such as self-sacrificing behavior toward relatives (which Hamilton's kin selection had already shown made sense once you count gene copies, not individuals) and apparent conflicts of interest within a single body (different genes 'wanting' different things, like parent-offspring conflict over resources). Dawkins was explicit that 'selfish' described the gene's effective behavior over evolutionary time, not any conscious intent — genes have no minds — but the metaphor made an otherwise abstract statistical process intuitive.
In Dawkins's framework, why does natural selection make more sense analyzed at the level of the gene rather than the individual organism?
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The explanation above is written with AI assistance. These are the originals — go to them to check it.
- The Selfish Gene (1976)Oxford University Press
Kin Selection and Inclusive Fitness
"Evolution doesn't just favor genes that help the individual survive — it favors genes that help copies of themselves survive, wherever they happen to sit, including in relatives."