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SCR-030 · Human Origins · HUMAN ORIGINS · NATURAL SELECTION

Are Humans Still Evolving?

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Medicine and culture changed the selective environment. They did not switch evolution off.

Last reviewed 10 August 20263 sourcesVerdict version 1
Evidence rule: Evolution means changes in inherited variation across generations. It does not require dramatic new anatomy, and it does not imply that every modern trait is adaptive.

Evolution did not stop

Human populations still vary genetically, people still differ in reproductive success, mutations still arise and populations still mix. Those are enough for evolution to continue even in technologically advanced societies.

Ancient DNA can watch selection move

Large ancient-DNA datasets now track allele-frequency changes through time rather than inferring everything from living populations. Recent work across West Eurasia finds widespread directional selection, especially in traits connected to immunity, metabolism and environment.

Culture changes the pressure

Agriculture, urbanisation, pathogens, diet, contraception, education and medicine alter which traits affect survival or reproduction. Culture can weaken one selective pressure while creating another, making human evolution increasingly gene–culture coevolution rather than a purely biological story.

Why change can be hard to see

Many traits are influenced by thousands of variants with tiny effects. Selection on height, fertility or disease risk can therefore be statistically measurable without producing a visibly new kind of human.

Research record

Nature (2026), ancient DNA and directional selection in West EurasiaPeer-reviewed · open sourceUK Biobank / PNAS, directional and stabilising selection in contemporary humansInstitutional · open sourceUK Biobank, fertility and natural selection in contemporary humansInstitutional · open source
SCRIBE VERDICT

Are Humans Still Evolving?

Direct answer: Yes. Humans are still evolving, but much of modern selection is subtle, polygenic and entangled with culture, migration and medicine.

Evolution is ongoing. The strongest evidence comes from measurable allele-frequency change, ancient DNA and contemporary reproductive patterns—not from claims that humanity is heading toward one predetermined future form.

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Open research · SCR-030

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