MENTAL MODEL · M0058

Molecular Clock

SystemsHigh supportSystems Theory

Included

Version 1.0.0 · Updated 2026-07-28

CORE DEFINITION

The molecular clock is a metaphorical term: DNA or protein sequences accumulate mutations at a relatively constant rate over time, so genetic differences can be used to infer when two or more organisms diverged in evolutionary history. The macromolecules used are often DNA base sequences or protein amino acid sequences, calibrated with fossil and archaeological data. The concept was first proposed in 1962 based on hemoglobins of various animals, and is commonly used in molecular evolution to estimate the timing of speciation or adaptive radiation.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

Quantifying the scale of history. As a mental model, it prompts us to look for "variables that change at a constant rate" in a system, to serve as a clock for long-term evolution undisturbed by short-term environmental fluctuation.

anchor

Anchor fast decisions

Macromolecules accumulate mutations at an approximately constant rate, so sequence divergence is roughly proportional to divergence time; independent dated evidence such as fossils provides the calibration that converts genetic distance into elapsed time.

MINIMUM ACTION

In progress 0/1

Practice this model in one real situation:

When observing a system that evolves over a long period (an industry, an organization, a technology), identify a measurable variable that accumulates at a near-constant rate (such as patent counts or user behavior traces), use it as a time ruler, and anchor it with independent dated events.

Check to track your progress (stored locally)

Learning progress0%

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Source support: Explicit

link
zh.wikipedia.orghttps://zh.wikipedia.org/wiki/%E5%88%86%E5%AD%90%E9%90%98ZH · Explicit
verified
link
en.wikipedia.orghttps://en.wikipedia.org/wiki/Molecular_clockEN
verified

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