outbreeding

Noun

 * 1) The breeding of unrelated (or only distantly related) individuals.
 * Outbreeding is a positive thing, because of the wider gene pool.
 * 1) The mating of people from different groups (especially as a result of social proscription).
 * Outbreeding hinders earnest studies of archaeogenetics, making it thorny to know precisely about ancient populations, migrations and linguistic groups.