A project has been launched by a company in the Scottish Borders in an attempt to create a picture of the gene which causes so many people to have red hair in our region.
Red-heads make up 13 percent of the population of Scotland, the highest proportion in the world.
Now researchers at ScotlandsDNA in Melrose want to find out more.
Around 650,000 people in Scotland have red hair but they believe the figure for Scottish red hair gene carriers may be much higher, and could be as many as 1.6m.
Although a person might not have red hair, they could still produce red haired children if their partner is a carrier of a gene.
They are asking people to give a sample of DNA to try to find the true extent of the numbers with "red haired" genes.
Two copies of a recessive gene on chromosome 16 which causes a mutation in the MC1R protein are present when a person has red hair.
It can often skip generations and although some think it might be dying out, the gene is likely to carry on down the generations.