How do remote tribes that have no new genetic material for thousands of years not die out because of inbreeding?

Remote tribes that have no new genetic material for thousands of years do not die out because of in bre eding due to a phenomenon known as genetic drift . Gen etic drift is a random fluct uation in the frequency of alle les ( d ifferent versions of a gene ) within a population . In small populations , genetic drift can cause certain alle les to become more or less common , even if they do not confer any particular advantage or disadv antage . This can lead to a reduction in genetic diversity , but it is not necessarily harmful to the survival of the population as a whole . In fact , genetic drift can sometimes lead to the fix ation of advantage ous alle les , which can actually increase the fitness of the population over time . However , it is important to note that genetic drift can also lead to the fix ation of harmful alle les , which can have negative consequences for the population in the long run . </s>