only a few hybridizations actually have hybrid vigor, and hybrid vigor tends to go extinct after the second generation of hybrid pairs. there is no example of hybrid vigor in humans outside of mere trait sharing. in fact, a significant amount of evidence shows that mixing in humans tends to lead to higher rates of immunity problems, higher rates of a variety of mental disorders, especially psychosis, and a range of other problems. not to mention that hybridized humans have a tendency to get segregate from both parent groups as they are deemed unattractive to both.
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