Crossword Genius

Heredity unit (4)

Ross

I believe the answer is:

gene

'heredity 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 "- - Kelly, dancer" , "Bodily factor controlling heredity" , "___ Kelly, star of Singin' In The Rain, d. 1996" , "may be passed to child" , "Biological factor determining heredity" .)

I've seen this clue in The Sun, the LA Times, The New York Times, the King Feature Syndicate, The Star Tribune, the Universal, The Wall Street Journal and the Penny Press.
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