Crossword Genius

A segment of DNA (4)

Ross

I believe the answer is:

gene

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">a segment of dna</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for gene that I've seen before include "Vincent" , "Part of chromosome" , "Hereditary unit on chromosome" , "Bodily factor controlling heredity" , "Hereditary determinant" .)

I've seen this clue in The Guardian.
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