Genetic information? (3)
I believe the answer is:
gen
'information?' is the definition.
(gen can informally mean information)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for gen that I've seen before include "opening book, in short" , "Lowdown (sl.)" , "Knowledge" , "Informal information" , "Information yielded" .)