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Originally Posted by ashke
You can't get them that way. Identical twins = identical DNA = identical skin tone.
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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.
EDIT to say that after reading the snopes article they are fraternal twins not "identical twins" therefore there are two different eggs and sperm which makes it even more likely to occur (although still very rare).