Crossword Genius

It's hereditary (4)

Ross

I believe the answer is:

gene

(Other definitions for gene that I've seen before include "___ Kelly, star of Singin' In The Rain, d. 1996" , "-- Pitney, singer" , "Unit of heredity significance" , "Hereditary determinant" , "Biological factor determining heredity" .)

I've seen this clue in the Universal.
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