Biology / Bio 1671 · Atom · ~20 seconds

Molecular Evidence: DNA Universality

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All life shares the same DNA-based genetic code, and closely related lineages share more similar DNA sequences than distantly related ones.

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Comparing the same gene's sequence across two species and finding it nearly identical indicates a recent common ancestor.

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DNA's universal structure is evidence for one shared ancestor — it is not proof of any single lineage's relationships.