restored Juventus's four-point lead over Lazio, who won 2-1 at Torino Chasing a record-extending ninth straight Serie A title, the victory earlier on Tuesday.
Since losing the Italian Cup final to Napoli in a penalty shootout, Juventus have won all three of their league games since the restart.
Paulo Dybala opened the scoring shortly after the break by evading three defenders before firing in a low shot that Genoa goalkeeper Mattia Perin, on loan from Juve, could only get a weak hand on.
Seven minutes later it was Ronaldo's turn. The five-time Ballon d'Or winner gathered a pass near midfield, charged toward the goal and unleashed a blistering effort from 22 yards into the top corner past the outstretched Perin.
The Portugal star has now scored 24 goals in 25 Serie A matches this season.
Substitute Douglas Costa made it 3-0 by curling in a shot from beyond the area inside the far post as Genoa's defence looked on helplessly, with Andrea Pinamonti effort from a tight angle a mere consolation.
Juventus is Cristiano Ronaldo,He definitely puts the team on the map
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