Millions of novel genetic variants found in 1000 Swedish individuals. An extensive exercise to map genetic variation in Sweden has found 33 million genetic variants, 10 million of which are novel. Large-scale DNA sequencing methods were used to analyse the whole genome of 1000 individuals from different parts of the country. Source 4u.
Maybe some of these variants are what is keeping most people as blonde and blue eyed. I know many in Denmark, Norway and Sweden seem to be predominate in the blonde and blue genes.