Human Growth and Development / Unit 1 HGD 0015 short lesson, about 20 seconds
Epigenetics
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The idea
Epigenetics is the study of how environment and behaviour change the way genes are expressed, without changing the genes themselves.
In practice
Stressful surroundings triggering chemical tags on DNA that alter how particular genes are expressed.
Where people slip
Research suggests childhood trauma may sensitise the body's systems for regulating stress through chemical changes of this kind.
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