Gerbino made it 28-7 for the Big Green (3-0) on a 9-yard keeper with 3:57 left in the game to cap a 15-play, 84-yard drive that took over eight minutes.
The Quakers (1-2) needed less than two minutes to counter with a six-play, 75-yard drive and converted the 2-point attempt to cut the deficit to 13. Penn then recovered its onside kick but turned it over on downs, allowing Dartmouth to run out the clock.
Gerbino was 9 of 12 for 119 yards and ran 13 times for 77 yards. His 57-yard pass to Zack Bair opened the scoring.
Jack Traynor recovered a fumble and returned it 17 yards to give the Big Green a 14-0 lead late in the first quarter. Bair scored on a 17-yard run to make it 21-7 in the middle of the second quarter.
Karekin Brooks ran for 91 yards and two touchdowns for Penn.
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