I have heard and read on the Internet the disputed claim that mixed blood* children are smarter than their (non-mixed blood) parents.
It has been suggested that many beneficial effects on average health, intelligence, and height have resulted from an increased heterosis
Other examples of discussion of the claim:
- Yahoo Answer claiming it is false.
- Discussion of the claim for China
- Dismissal of the claim as relying on false premises
These sources couldn't convince me about the matter.
Is there any evidence to support the claim, to falsify it, or to demonstrate that it is an unscientific claim?
*I interpret "mixed-blood" to mean an offspring of parents of different races; i.e. having different ethnicity, skin color and geographical roots in general. For example, having a Japanese mother and African father.
Related question: Is race a discredited scientific concept in biology?