Crossword Genius

Parental units? (5)

Ross

I believe the answer is:

genes

'parental 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 "Biological factors controlling heredity" , "Units of heredity" , "Units of DNA" , "Factors governing heredity, carried by chromosome" .)

I've seen this clue in the New York Times, The Washington Post, the Wall Street Journal, the LA Times and the L.A. Times Daily.
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