Will it go into gear if clutch is out?

Stupid question-I know!

But if I have the clutch out for replacing, will the gear shifter put it into gear?

I only ask because someone said I might not have a clutch problem (it would not go into gear) but a tranny problem.

The clutch is out of bike but it will roll freely while I push the shifter down and it is apparently in gear.

If this is a tranny problem does this mean I have to tear motor apart or is this maybe located under the "mision" cover?

Dave R