Hair colour

Melanin levels (only two of those can be on "high" at once, one from the father and one from the mother):

• Black Eumelanin (white to black)
• Brown Eumelanin (white to yellowish brown)
• Pheomelanin (white to red) - MC1R gene, alleles Arg151Cys, Arg160Trp, Asp294His, Arg142His - also inhibit melanin production in skin, resulting in a paler skin.

Typical combinations:

• Black Eumelanin only -> Black
• Brown Eumelanin only -> Brown
• Pheomelanin only -> Red
• Black Eumelanin & Brown Eumelanin -> Dark Brown
• Black Eumelanin & Pheomelanin -> Chestnut Brown
• Brown Eumelanin & Pheomelanin -> Auburn
• low amount of all -> Blonde
• negligable amount of all -> White