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Whether you put your left thumb on top or your right thumb on top when you clasp your hands is determined by a single gene. There are many variations in the gene that controls red hair pigment, and this gene can be influenced strongly by genes that control brown hair. The moral of the story? So why has this rumor drawings of lips sticking her tongue out McDonald says that in some cases, the environment plays a part. Subscribe to our Newsletter! Red hair is determined by a single gene that yields to other colors. Indeed, two parents with red hair can have kids with brown or blonde hair.