United have their tails up now and Nick van der Velden cracks a shot against the post, although an offside flag means it wouldn't have counted if it had been a smidgen more accurate.

Former Dundee United striker Steven Thompson on Radio Scotland: "It was a really soft goal from Morton's perspective. The ball was played through but it evaded two of their players. Dundee United are back in the game and it is really out of nothing, because from the start of this second half, Morton were probably the better side."

Queen of the South come again and Rangers can't clear their lines and Derek Lyle rides a couple of weak challenges before smashing an angled shot over the crossbar.

The Doonhamers are not out of this game as Derek Lyle and then Stephen Dobbie flash shots wide from 18 yards out.

A poor pass-back from Andy Dowie is intercepted by Martyn Waghorn but the Rangers striker can only lift the ball over the top from six yards.

It's all Morton at the start of the second half, with Jai Quitongo and Gary Oliver causing the United defence all sorts of problems with their darting runs. 

Another corner to the hosts, Thomas O'Ware wins it again and Cammy Bell has to make a smart stop.

Jai Quitongo profits from some shaky United defending but can't get a clean shot away or pick out team-mate Gary Oliver, who was screaming for a pass. Thomas O'Ware threatens again from the resulting corner, with his header zipping over the top.

Back under way at Ibrox. Barrie McKay is on for Rangers goal-scorer Jason Holt.

Morton have one foot in the League Cup semi-finals. Can they get the job done in the second half?

Chick Young
BBC Scotland at Cappielow

"Brilliant first half display from Morton. Jai Quitongo is on his way to being a star - about to eclipse his old man Jose - and Jim Duffy's tactical wisdom illustrated at the second goal. Thomas O'Ware's goal clearly one from the training ground."

Here's a snap of the only goal at Ibrox. There was plenty of fizz on Michael O'Halloran's pass and Jason Holt just needed to steer it home from inside the six yard box.

Image source, SNS

Martyn Waghorn pops up behind the visiting defence to meet a lofted ball over the top but he's in an awkward position and can only flick it wide from close range.

That's the last chance of a half completely dominated by the home side.

The home side are good value for their lead, although there were stirrings from United as the first half drew to a close. 

With half time almost upon us, United seek a way back and Scott Fraser draws a good save from Andy McNeil with a shot from distance. The keeper then mops up the danger from the following corner.

Lee Hodson breaks into the Queens penalty box from the left-back area but he's not a leftie and cuts back on to his right before flashing a shot narrowly over the top.

Former Dundee United striker Steven Thompson on Radio Scotland: "It was all about the quality on the corner from Ross Forbes, which was outstanding.  O'Ware got in front of the defenders and really attacked it.  Morton have been the better side and since they scored the opener, they have looked threatening. It is just not working for Dundee United at the moment."