Genetics

[] Two types of melanin, eumelanin and pheomelanin, are what make you hair certain colors or shades. For the most part, the more melanin in your hair, the darker it is. And of course, the less melanin the lighter the hair color. Melanin levels can change throughout your life and therefore can change or alter your hair color. On a personal note I was born blond. Eumelanin has two, kind-of sub colors: black and brown, which determine the darkness. Pheomelanin makes hair red, and surprisingly everyone has some pheomelanin in their hair. Lack of brown eumelanin causes blond hair, and lack of black eumelanin causes gray hair. A phenotype (brown/blond) has a dominant brown allele and a recessive blond allele. This explains why two brown haired parents can have a blond haired kid.

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