From Darwin's Plantation......

Below is a Punnett Square of theoretical situation where both parents are of medium skin tone. This shows that although the parents display a certain appearance they have the ability to produce a variety of skin colors in their offspring including very light as well as very dark skinned children and everywhere in between.

AaBb x AaBb


         AB          Ab          aB            ab

AB    AABB     AABb     AaBB      AaBb


Ab    AABb     AAbb      AaBb       Aabb


aB    AaBB     AaBb       aaBB       AaBb


ab    AaBb      Aabb       aaBb        aabb


Adam and Eve could not have been “black” or “white”. If Adam and Eve were white then everyone today would be white. If Adam and Eve were black then we would all be black. This shows that Adam and Eve would have been middle brown. The reason why is because white people can no longer have black babies and black people can no longer have white babies. Now middle brown people can have any color of baby!!

Check out these "Twincredibles"

http://blogs.answersingenesis.org/aroundtheworld/2009/01/04/another-set-of-black-and-white-twins/