Biology / Bio 1649 · Atom · ~20 seconds
Descent with Modification
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Descent with modification is Darwin's term for how natural selection, acting repeatedly across generations, gradually changes a lineage's inherited traits over time.
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Darwin's only diagram in *On the Origin of Species* depicts descent with modification as a branching pattern of ancestry.
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Descent with modification describes gradual change within a lineage — it names the pattern selection produces, not a separate mechanism.