The inherited trait is "white forelock" which is a white lock of hair just above the forehead.
(The inherited trait; is; white forelock" which is a white lock of hair just above the forehead) (white forelock; is; a white lock of hair just above the forehead)
The inherited trait white forelock
is is
white forelock" which is a white lock of hair just above the forehead
a white lock of hair just above the forehead