Gene
Helix
Image from Anders Sandberg

In terragen biology an ordered sequence of nucleotides located in a particular locus on a particular chromosome that encodes a specific instructions for the cell, generally biochemical material, either RNA or protein. It includes regions involved in regulation of expression and regions that code for a specific functional product.

In xenobiology genes can take many forms, but in organic carbon-based biospheres nucleic acids of various kinds DNA, RNA, TNA, PNA and so on generally predominate.
 
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Development Notes
Text by M. Alan Kazlev

Initially published on 31 October 2001.