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Gene
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*[[Coding DNA]] - [[Gene]]s which are '[[Gene Expression|expressed]]' which means used as the templates for [[Protein Synthesis|protein synthesis]].
*[[Non-coding DNA]] - [[Gene]]s which affect whether other [[gene]]s will be [[Gene Expression|expressed]]. These [[gene]]s are said to 'turn off' parts of the [[DNA]] and can respond to environmental changes.
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f320 ''Gene, pages 24-2, 32, 236-9, 300-1, 304-5, 308-9, GCSE Biology; Student Book, Collins, AQA '']