Based on the information given I could think of two possibilities. I would think that any cloning would be in order to combine desirable traits for the new planet in a single body in order to pass on superior traits to future generations born naturally. I would also assume that cloning would be looked down upon because it limits genetic diversity among the very small initial crew which would lead to genetic defects further down the generational lines. (Unless of course there are gene therapies to treat such ailments, we are approaching star-trek tech after all.)
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