What about who are in the colony pods that are launched by colony ships?
Nobody is in the colony pod... colony pod are big cloning machine who host a lot of various ADN sample...
These new way of colonize allow to have a fast growing population without the need of a huge colony ship... ADN sample don't need food or air during the transit and take very little place...
Once landed, engine of the colony pod are convert in a accelerated growing center who allow to have a fast increase rate of population... no more need to wait several generation sexual reproduction for only a light increase of population...
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It is sci-fi, simply use your own imagination and create your own story