twoshots wrote:
^Huh? Skin color is determined by several genes under incomplete dominance. Obama is darker, but clearly not very dark.
Ok, I used the wrong term for the genetics. But race is not a purely genetic construct - it is perceptual and social as well.
There is a perceptual dominance in terms of these genes, skin color, and race. An imperfect but illustrative analogy: If a fully "colored" is a glass of water with a lot of dye in it, and "not colored" is pure water, mixing 100 ml of the fully colored water with 100 ml of the clear will result in 200 ml that is exactly intermediate in terms of concentration (aka incomplete dominance), but which people judge to be colored.
Likewise, in map making, the perception of ink is not usually proportional to the amount of ink on a page - it is more of an S shaped curve. A little extra pigment doesn't have much effect on how dark people see something that is light, but after a threshold, there is a steep rise, and around 90% ink, a person loses the ability to distinguish between really dark and completely dark.
This is reflected in many of the traditional 'tests' for blackness - the paper bag test, the one-drop test, etc. In that sense, African genes are more dominant in determining race as it is commonly constructed.
Of course, all of these rules and perceptions are unscientific, but they have also been a social reality that powerfully structure the way people have been allowed to live. We cannot talk about race perceptions in America purely in terms of genetics, when it is a cultural phenomena based on unscientific beliefs and values.