Like some markers (7)
I believe the answer is:
genetic
'like some markers' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for genetic that I've seen before include "- - code (biol.)" , "(The code) of our DNA" , "relating to origin" , "Tending to occur among members of a family usually by heredity" , "Pertaining to heredity" .)