Crossword Genius

Hereditary units (5)

Ross

I believe the answer is:

genes

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

This is all the clue.

(Other definitions for genes that I've seen before include "Factors governing heredity, carried by chromosome" , "Units of DNA" , "Biological factors controlling heredity" , "Units of heredity" .)

I've seen this clue in the Evening Standard.
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