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molecular clock

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technique to deduce the time in prehistory when two or more life forms diverged

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chemical clock
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Encyclopedic overview

The molecular clock is a figurative term for a technique that uses the mutation rate of biomolecules to deduce the time in prehistory when two or more life forms diverged. The biomolecular data used for such calculations are usually nucleotide sequences for DNA, RNA, or amino acid sequences for proteins.

Early discovery and genetic equidistance

Excerpted from Wikipedia’s “molecular clock” article, available under the CC BY-SA 4.0 licence.