All Causes
The secret behind the birth of white-skinned and dark-skinned twins lay in parthenogenetic inheritance. Certainly, common sense would dictate that a dark-skinned child could not be born to a Caucasian couple. However, due to the influence of Emily’s grandfather’s genes, only one of the fraternal twins inherited dark skin. The strong visual contrast of only one of them having dark skin. This was the rare case of a twin with different fathers that James had once seen on television. These two factors were the decisive factor in his suspicions.
