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[–] LobYonder ago 

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[–] Commie_Meta ago 

This does not apply to humans. We are all descended from about 2,000 people who lived 50,000 years ago. That is so few individuals that there was a big chance of extinction just from the numbers.

Each of the human races shares most of their mutations because of this. What differs is just the frequency of the mutations. If you could slice and dice the African DNA and put it back together, you could make a Caucasian. You could turn Eskimos into Arabs with a few centuries of selective breeding.

An example of actual outbreeding depression is the mule, produced by mating a horse with a donkey. Most mules are infertile, an evolutionary dead end.