Crossword Genius

Hereditary unit (4)

Ross

I believe the answer is:

gene

'hereditary unit' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for gene that I've seen before include "Hereditary determinant" , "Factor controlling heredity carried by chromosome" , "What makes us different" , "Something got from parent < for boy" , "Part of chromosome" .)

I've seen this clue in The Mirror, the King Feature Syndicate and the Evening Standard.
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