Crossword Genius

Heredity unit (4)

Ross

I believe the answer is:

gene

'heredity unit' is the definition.
(I've seen this before)

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