The victory saw the Baggies regain top spot in the Championship with three games left.
Gera had seen a header smack against the woodwork in a breathless opening 45 minutes but made no mistake in the 59th minute.
A quick ball forward caught the Wolves defence square and after Kevin Phillips had skipped over the challenge of Neill Collins, he was able to slide a ball across the six-yard box to Gera who side-footed home unmarked.
Albion are now two points clear of Hull, while Mick McCarthy’s Wolves – who matched their opponents for most of the game – are not yet out of the play-off picture. They stay eighth, three points behind sixth-placed Crystal Palace with a game in hand.