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Originally Posted by sktzofrenic
Identical twins does indeed mean the same sperm and therefore the same DNA, but please keep in mind that not all the genotypes in the DNA will express itself as a phenotype. In this case they both have the genes for both black and white skin but only one phenotype in this case expressed itself.
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Identical twins WILL have the same skin color. You are thinking of incomplete dominance or genes that can switch on and off. Multiple alleles (genotype) contribute to skin color (phenotype) in human beings. If you have the identical set of alleles, you will have the identical skin color of your twin.
Explanation for those with a scientific bent.