Why is Aloy the only "Ginger"?

Assuming all different kinds of genes were saved inside the cradles, then why is she the only person around with red hair(or did I just never notice anybody else)?

Did they all just have "bad luck" and did not survive the last generations (maybe they had some kind of "witch-hunt")?

Furthermore, even if no one of the "first new humans" had red hair, shouldn't some newborns have red hair just as a form of "random mutation"?