The theory that best fits the facts is that Adam and Eve were created with 2 alleles for each of these genes so they had the genetic potential for all skin colours.
Your theory is nonsense. Even some folks with the same skin color have that color because of different alleles. Four alleles cannot and do not explain reality.
Secondly, there is more than one variety of melanin, with the varieties having different colors, so saying that there is only one pigment is just wrong. See pheomelanin and eumelanin.
Edited by NoNukes, : No reason given.
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