Evolution by Natural Selection in Action
Natural selection changes populations when heritable differences affect survival and reproduction. Cultural practices can also change through transmission, variation and differential spread, though cultural copying differs from genetic inheritance.
THE IDEA
Evolution by Natural Selection in Action
Natural selection requires variation, inheritance and differences in reproductive success. Biological populations can evolve even though offspring are not exact copies of their parents.
- Biological evolution
Humans, like other species, evolve. Genes are inherited through reproduction, and mutation and recombination contribute to genetic variation. When inherited differences affect reproductive success, their frequencies can change across generations. A focus on genes helps explain inheritance; it does not mean that only cloned organisms could form an evolving population.
The claim that humans simply beat other species is also an inadequate description. Humans are apes, and several other ape species still exist. Competition, environmental change and interbreeding can all be relevant to the history of human populations.
- Cultural evolution
Researchers including Joseph Henrich study how cultural practices change as people learn from one another. Language, rituals, tools and other practices are transmitted across generations, sometimes with high fidelity and sometimes with modifications. Variation can come from copying errors or deliberate innovation.
Practices differ in how successfully they spread. People may copy something because it is useful, because a respected person does it or because social pressure favors it. Successful transmission does not necessarily mean a practice benefits everyone who adopts it.
The comparison with biological evolution draws attention to transmission, variation and differential persistence. Cultural change also involves intentions, institutions and learning, so it should not be treated as identical to genetic evolution.
When to use it
Understanding the evolution of languages and dialects through differential adoption of vocabulary and grammar.
Analyzing the rise and fall of business practices or management techniques as they are copied, adapted, or abandoned.
Explaining the persistence of religious rituals that reinforce social cohesion.
Studying how misinformation is copied, modified and shared, and why transmission success can differ from truth or usefulness.
FROM THEORY TO EVERYDAY LIFE
In practice
Human populations evolve
Children inherit genetic material from their parents without being identical copies. Heritable variants can become more or less common across generations, so a human population can evolve through natural selection.
Cultural evolution through natural selection
A toolmaking technique spreads as learners copy it. Some introduce changes deliberately or by mistake, and some versions are copied more often than others. This illustrates cultural transmission and selection without assuming that the most widely copied version is always the most useful.
A MOMENT TO REFLECT
Put it to work.
How does the concept of replication apply to the spread of memes or viral internet trends?
How does inheritance allow a population to evolve even though offspring differ from their parents?
Can you identify a modern cultural practice (e.g., a greeting ritual, a fashion trend) that has changed over time due to natural selection pressures?
CONTINUE THE CONVERSATION
Source texts
- Thinking in Systems and Mental Models Think Like a Super Thinker (Dawson, Marcus P)