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 all the 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 Wall Street Journal, the King Feature Syndicate, the LA Times, The New York Times, the Penny Press, The Sun and The Star Tribune.
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