there is no "white" gene!
Out of interest (and not wishing to give ammunition to the racist morons), is the expression of the melanin-producing gene epigenetic? Otherwise, there would have to be observable differences in the genome to account for the difference in expression.
(And I'm fully in agreement - the differences between the 'races' is a matter of culture and upbringing, not base genetics)
 As you can see - I think that word isn't really meaningful..