Category B - full version without watermark 720x576 (check terms and conditions at www.teledesign.de) The version with watermark is for free to embed. Hair color and eye color are traits which depend on the presence or absence of particular alleles of genes that produce color pigments. There are a number of different genes that are responsible for eye and hair color, but they seem to be found primarily on chromosomes 19 HCL1. This gene has multiple alleles which produces different levels of color pigments. Most members of our species have brown hair and brown eyes because most people have pigment genes that produce brown pigment (eumelanin).