The Finns and Swedes are arguing eye color. So, Eye colour: portals into pigmentation genes and ancestry:

Several recent papers have tried to address the genetic determination of eye colour via microsatellite linkage, testing of pigmentation candidate gene polymorphisms and the genome wide analysis of SNP markers that are informative for ancestry. These studies show that the OCA2 gene on chromosome 15 is the major determinant of brown and/or blue eye colour but also indicate that other loci will be involved in the broad range of hues seen in this trait in Europeans.

One major locus, but lots of little modifier loci which an account for shades of green, gray, etc. (not to mention epigenetically derived variation). Also, remember this isn't MC1R, so that is why eye color and hair color are inherited independently. Take that Jaakkeli! You lemur-eyed freak!

Labels: Genetics, Pigmentation