[Bellflower]

...or both Adam and Eve were brown, not black nor white but with dark genes and light genes. When light genes eventually paired you would have "white", when dark genes paired you would have "black", when dark and light genes paired you would have various shades between.

[OldSpice]

If 6 billion individuals were sourced out of this mythical Adam and Eve, all of these inbreds would be dropping like flies in a rainfall of pesticide, due to genetic abnormalities accumulating over the generations.