[Hajman]

I said that, and it's true. There is no one-to-one mapping between those genes and a person's race. Thus, no definitive genetic test for ethnicity exists.

Who says there has to be a one-to-one mapping between genes and traits? We can easily come up with a definitive genetic test for skin color simply by looking at the genes that map out skin color. At Genetic Control and Melanin look for Skin Colour (about half way down the page). It shows how genes code for skin color. There doesn't have to be a one-to-one gene-to-trait relationship, but there is a one-to-one gene coding-to-trait relationship. There's no known such homosexual genetic coding. There's no combination of genes that code for homosexuality. This can be easily demonstrated in genetic twins where one becomes homosexual, and the other hetrosexual; and this isn't the exception.

-The Hajman-

[general_re]

There are Asians who are darker-skinned than some black people, and some black people who are light enough to pass for white. Anyway, it doesn't matter - lemme ask you this. If there were such a test, that could definitively show someone's ethnicity, should taking that test be a precondition for, say, black folks to receive affirmative action benefits?