Basic unit of heredity (4)

I believe the answer is:

gene

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

This is all the clue.

(Other definitions for gene that I've seen before include "Part of chromosome" , "Hereditary DNA sequence" , "Vincent" , "Bodily factor controlling heredity" , "Something got from parent < for boy" .)

I've seen this clue in the USA Today and the Newsday.

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