In general, keeping genetics varied is a good thing. Mixing populations which have long been separated makes it unlikely that both parents carry the same 'autosomal recessive disorders' (and therefore the child will not be effected). This is known as the hybrid (or heterozygote) advantage, and it follows that there are many detriments to inbreeding. Yet there can be cases where breeding two distant populations of a species can cause more harm than good. This is known as underdominance, and it can occur when two populations have both evolved to exploit respective niches. Hybrids across such populations can - as opposed to benefiting from the genetic diversity - lose the advantages of both their parent populations.
Bonus:
The 'Ain Ghazal Statues of Jordan are among the oldest humanoid objects known, with some dating to the 8th millennium BC. One was loaned to the Louvre from Jordan in the 1990s, and is currently the oldest object in the museum (at roughly 9,000 years old).
Bonus:
The 'Ain Ghazal Statues of Jordan are among the oldest humanoid objects known, with some dating to the 8th millennium BC. One was loaned to the Louvre from Jordan in the 1990s, and is currently the oldest object in the museum (at roughly 9,000 years old).
-E
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