going to seed

Can female marijuana plants produce seeds without the presence of pollen? ie. If I have seeds appearing on my budding females, then does this mean there is pollen present in my bud room? - And what do I have to do to get rid of it?

it means they are hermi's; try plucking the balls off

This is my third generation ie. First crop from seed, second and third crops were clones of one and two. First crop had no seeds. Second had a few. And third is loaded with seeds. Is this typical?

Maybe this should be a separate post, but is it normal for a strain to deteriorate after several clonings?

No, a clone should be the exact replica "clone" of the previous plant. It must have been heat stressed or water stressed. If the mother is giving bad clones, time to find a new strain