Jackson led the Seahawks to a trio of field goals from Steven Hauschka, including kicks of 51 and 56 yards. Jackson got the bulk of time in the first half after Russell Wilson made a brief cameo, leading the Seahawks to their first touchdown on their opening drive.
Hauschka also hit from 22, 43 and 53 yards.
Pryor had turned the Raiders' quarterback situation into a real competition with his performance during the preseason. Matt Flynn sat out Thursday with a sore elbow, and Pryor was given an entire half to try and show he deserved the job. He was lackluster, completing 3 of 8 passes for 31 yards and an interception.
Seattle won its ninth straight preseason game. Jackson finished 12 of 17 passing for 119 yards and likely locked up the backup job to Wilson.
Meanwhile, Oakland coach Dennis Allen has a difficult decision: start the season with Pryor or, if he's healthy, go with Flynn.
Pryor flashed a little of what had his home fans chanting his name last week. On his second drive, Pryor threw darts to Rod Streeter for a pair of 14-yard receptions and later added a 25-yard scramble that led to the first of Justin Medlock's two field goals.
But he was not impressive to the point of making the decision obvious for Allen. Pryor also didn't see much of the field.
Following the field goal, Seattle kept the ball for nearly eight minutes on a 17-play drive that led to Hauschka's 22-yard field goal. Pryor immediately gave the ball back to Seattle, underthrowing Jacoby Ford on a deep pass and Seattle's Walter Thurmond made a one-handed interception. Seattle then had an 11-play drive leading to another Hauschka field goal.
Most of the interest on the Seahawks' sideline had to do with guest Snoop Dogg, who sported a gray No. 24 jersey with "Snoop" across the back and Seahawks gloves. He was in the locker room before the game and left for his scheduled concert nearby during the first half.
Wilson and most of Seattle's starting offense was in for all of three minutes. Wilson hit Stephen Williams for 50 yards on the second play of the game, later scrambled for 11 yards, and finally found rookie tight end Luke Willson for 20 yards. Robert Turbin then capped the drive on a 3-yard run and Wilson's night was complete.
The Seahawks did have two injuries that could have an impact on the final 53-man roster. Williams suffered a concussion on his 50-yard reception, and rookie offensive lineman Michael Bowie injured a shoulder. Both were expected to be on the edge of making the final cuts.