Growing a third arm

Since having (eg.) two arms is a result of evolution, how can we, considering modern technology, force embryos to grow another limb? Polymelia is known to me, but it is considered a birth defect. I know that evolution is only possible because of random mutation. I guess an alternative evolution needs parents to derive genes from.

Is it possible today, or would it be possible in the future to trigger growth of limbs by forced Mutation and if so, how many generations would it take to come to the point, where the third limb is as efficient as the other two?

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Growing a third arm

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