concept1859-present

Natural Selection

Disciplines:

Summary

The mechanism of evolution proposed by Darwin and Wallace: heritable variations in traits that affect survival and reproduction will increase in frequency over generations — explaining adaptation without design.

Core Contribution

Three conditions sufficient for evolution by natural selection: (1) variation — individuals differ in traits; (2) heritability — traits are passed to offspring; (3) differential fitness — some variants survive and reproduce more than others. Given these conditions, adaptive evolution is inevitable — no design, no foresight required. The power of the mechanism: given enough time and variation, it can produce any level of apparent design. Combined with Mendelian genetics (Modern Synthesis): the complete mechanistic explanation of biological adaptation.

Key Spikes & Highlights

Darwin delayed publication of the Origin for ~20 years — sitting on his theory for fear of the reaction. The arrival of Wallace's independently derived manuscript in 1858 forced his hand.
The mechanism of natural selection is substrate-neutral: it applies to any system with variation, heritability, and differential fitness — including cultural variants, algorithms, and immune cells. This generality (Universal Darwinism) is its most important feature.

Historical Influences

Thomas Malthus Gregor Mendel

Intellectual Lineage

Natural History Political Economy

Allied Works

On the Origin of Species The Selfish Gene The Extended Phenotype

Contemporaries & Peers

Lamarckism Catastrophism

Minds Influenced

Genetics Ecology Psychology Economics

Intellectual Posterity

Modern Synthesis Population Genetics Evolutionary Psychology Sociobiology

Discussing