Crossword Genius

Trait origin (4)

Ross

I believe the answer is:

gene

'trait origin' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for gene that I've seen before include "Part of chromosome" , "Hereditary DNA sequence" , "Unit of heredity significance" , "Hereditary molecule" , "___ Kelly, star of Singin' In The Rain, d. 1996" .)

I've seen this clue in the Penny Press and the New York Times.
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