## 1. Identity **Title:** The Extended Selfish Gene (orig. *The Selfish Gene*, 1976; 40th-anniversary ed. 2016 with chapters from *The Extended Phenotype*) **Author:** Richard Dawkins **Source summary:** polymatas.com/biblioteca/el-gen-egoista-extendido (Spanish, 25 pp.) **Original URL:** https://polymatas.com/biblioteca/el-gen-egoista-extendido --- ## 2. Core Contribution Dawkins reformulates Darwinian natural selection as a gene-level process. The organism — any organism, from virus to human — is a *survival machine* built and steered by its genes. Natural selection acts on genes (replicators), not on individuals or groups. The 40th-anniversary edition appends two chapters from *The Extended Phenotype*, arguing that gene effects reach beyond the body of the organism that carries them. --- ## 3. Method and Structure Thirteen chapters structured as a logical sequence: - **Chs. 1–4** — Lay foundations: why the gene is the unit of selection, what replicators are, how DNA replicates and recombines. - **Chs. 5–10** — Show survival machines maximising gene propagation: aggression, parental investment, sex-ratio conflicts, kin altruism, reciprocal cooperation. - **Ch. 11** — Introduces *memes* as cultural replicators analogous to genes. - **Ch. 12** — Evolutionarily Stable Strategies (ESS) and the hawk-dove game from evolutionary game theory. - **Ch. 13** — Summarises the Extended Phenotype thesis: gene effects can extend beyond the organism's body. - **Appended chapters from *The Extended Phenotype*** — Deepens the replicator/vehicle distinction and parasite manipulation examples. A large endnotes section corrects or extends claims from the 1976 text without altering the original prose. --- ## 4. Key Results and Ideas | Concept | Claim | |---|---| | Replicator | First self-copying molecules; ancestors of DNA; the true unit of selection | | Selfish Gene | Genes that promote their own copying propagate; "selfish" is metaphorical, not intentional | | Survival machine | Organisms as vehicles built by genes for gene propagation | | Inclusive fitness | Altruism toward kin explicable by shared gene fraction (Hamilton's rule: *rb > c*) | | ESS | A behavioural strategy that, once prevalent, resists invasion by alternatives | | Meme | Cultural unit propagating by imitation; subject to selection-like pressures | | Extended Phenotype | Gene effects (dams, nests, parasite behaviour manipulation) extend beyond the organism | --- ## 5. Why It Matters Reframes the entire question of animal (and human) behaviour — altruism, aggression, parental investment, cooperation — in a coherent gene-centred framework. Introduces the concept of memes, anticipating much of cultural-evolution theory. Offers a powerful rebuttal to group-selection thinking. Remains foundational reading in evolutionary biology more than four decades after first publication. --- ## 6. Limitations Noted by Dawkins Himself - The meme hypothesis is explicitly speculative; the dual inheritance / gene-culture coevolution framework has since become the dominant paradigm. - The original text is preserved verbatim; corrections appear only in endnotes, so readers must cross-reference. --- ## 7. Link to Original https://polymatas.com/biblioteca/el-gen-egoista-extendido