Read this article a couple days ago and I am still mind-blown.

Notable excerpt: "a biracial child contains and reproduces fewer of the distinctive genes from any one of its parents than does a monoracial child. In other words, a child born to a man and women of the same ethny is genetically closer to its parents than is a mixed-race child, because the parents have many distinctive genes in common, and the child is therefore a combination of genes that make it close to both parents. A mixed-race child is genetically more distant from both parents because half its genes come from a parent from a different — and genetically distant — ethny.

The relationship can be understood this way. A parent has a certain base-line kinship with his child no matter who the other parent is, but is genetically closer to his children if he marries within his ethny. This gain in parental kinship is foregone to some extent when the other parent is of a different race or ethny. An average European white who has a child with a typical African foregoes 66 percent of the parental kinship he would have gained if he had had the child with another European. An Englishman who picks a Danish rather than an English spouse loses only one percent of the parental kinship to be gained from an English spouse. Choosing a Bantu mate would mean the loss of 92 percent of the parental kinship that would have been gained with an English mate. This figure, which is close to 100 percent, raises the theoretical possibility that if an Englishman has a mixed, English-Bantu child, the child will receive so many non-European genes from the Bantu parent that the Englishman is only slightly more genetically related to his own child than he is to a random stranger from his own ethny."

Might this be why people are generally attracted to those of their own race?