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MENTAL MODEL · M13056

Epigenetics

Epigenetics
SystemsHigh supportBiological Evolution
Included
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Updated 2026-08-11

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INTRODUCTION

English translation pending.

CORE DEFINITION

Epigenetics studies chemical modifications such as DNA methylation and histone modification that switch genes on or off without changing the underlying sequence. Because the sequence is untouched, the same genome can produce different outcomes under different environments, and some modifications persist through cell division and can be transmitted across generations. The Dutch Hunger Winter of 1944 to 1945 is the classic case: people exposed in utero showed markedly higher rates of metabolic disease decades later. Changes appear far faster than mutations, which lets organisms respond within a few generations, but later conditions can also reverse them.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

- Layer split: separate a structural difference from a difference in how a gene is expressed - Trigger search: identify the environmental factor that is flipping the genetic switch - Reversibility test: ask whether the change fades once the surrounding environment shifts back again

anchor

Anchor fast decisions

Environmental signals attach chemical marks to DNA or to the proteins that package it, which changes whether a gene is read without changing what it says. Because these marks are copied during cell division, the new expression state persists after the original signal disappears. That persistence is what makes the effect visible at the level of traits, and in some cases it survives into the next generation. The speed comes from regulation rather than mutation, which is also why the change can be reversed if the environment shifts back.

MINIMUM ACTION

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Source support: Explicit

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    mungermodels.comhttps://mungermodels.com/models/epigeneticsZH · Explicit
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