The short answer to all of these questions is "Yes". Already in mice, and there's no reason to think it wouldn't be possible in humans someday. Although I think

The short answer to all of these questions is "Yes". Already in mice, and there's no reason to think it wouldn't be possible in humans someday. Although I think it's a ways out; we can induce pluripotent stem cells and do some differentiation into other cell types but I don't believe we're at fully functional germ cells in humans.