"They gave 77 white female Michigan State students several standard measures of racism at different times in their cycles. The "race bias" curve on the graph is a combination of the measures.
Their interpretation is based on evolution, avoiding outgroup fathers who won't be around to take care of the mother and child. One problem I see with that interpretation is that it is better for evolution to mix genes as much as possible. I don't really have a better explanation, though."
"marriages between third or fourth cousins in Iceland tended to produce more children and grandchildren than those between completely unrelated individuals"
Here's the key graph: http://imgur.com/bFcOw.png
And his explanation:
"They gave 77 white female Michigan State students several standard measures of racism at different times in their cycles. The "race bias" curve on the graph is a combination of the measures.
Their interpretation is based on evolution, avoiding outgroup fathers who won't be around to take care of the mother and child. One problem I see with that interpretation is that it is better for evolution to mix genes as much as possible. I don't really have a better explanation, though."
Also, this article seems relevant: http://abcnews.go.com/Health/ReproductiveHealth/Story?id=425...
"marriages between third or fourth cousins in Iceland tended to produce more children and grandchildren than those between completely unrelated individuals"