Board Thread:General Discussion/@comment-27596920-20141205004927/@comment-4010415-20141218035109

Even if someone isn't blonde, they can still carry the gene for blonde hair. I think the blonde hair gene might be recessive to another color, like black. If two people who carry the recessive gene have a child, and they contribute an egg and a sperm that both carry that recessive gene, then the gene will present itself in the child.