If you have naturally black hair, you carry one of the most common hair-color patterns found across human populations. But the biology behind dark hair is more complicated than simply saying that “black hair is dominant.” Hair color is primarily determined by the amount, type, and distribution of melanin produced by specialized cells in the hair follicle, especially the balance between eumelanin and pheomelanin.

Multiple genes influence this process, including MC1R, TYR, TYRP1, OCA2, SLC45A2, and others, which help determine how much pigment is produced and what type of melanin dominates. Because these genes interact with one another, naturally black hair cannot be traced to one single genetic switch.

In this documentary, we explore what DNA reveals about naturally black hair, how eumelanin produces darker hair colors, why black hair became widespread across many human populations, how genetics and natural selection shaped hair pigmentation, why hair color does not directly identify one specific ancestry, and what your hair can—and cannot—tell you about your evolutionary history.

The deeper mystery is that something as ordinary as naturally black hair reflects a complicated interaction between genetics, pigmentation, evolution, and human population history.

What surprised you most about the genetics of black hair?

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