Kelly's units of heredity (5)

I believe the answer is:

genes

I'm a little stuck... Click here to teach me more about this clue!

'units of heredity' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for genes that I've seen before include "Biological factors controlling heredity" , "Units of DNA" , "Units of heredity" , "Factors governing heredity, carried by chromosome" .)

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.