Stem Cells Explained

Here at the University of Michigan website. It is neatly done presentation aimed at you ane me, the intelligent science reader. In other news, a research breakthrough where stem cells can be produced without destroying human embryos might be what researchers were looking for in the US.

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Embronic stem cells are taken from life. If you destroy life at any stage even at the very beginning of it, then logically life can be destroyed at any later stage.
Talking about using embronic stem cells without destroying life is a contradiction of terms. It makes no sense.

I have a question. Two, actually:
1. Can stem cells differentiate into gametes?
2. If a person is genetically predetermined to have produce only defective sperm, then, will his stem cell also differentiate into defective sperm only? (if at all a stem cell can change into a gamete)