Identical twins may resemble each other more than fraternal twins because they share the same

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Identical twins result from a single fertilized egg dividing into two embryos. Therefore, they have the same genotype, or genetic makeup. Fraternal twins, on the other hand, result from separate eggs fertilized by separate sperm, and therefore share only 50% of their genetic makeup, like any other siblings. While twins (both fraternal and identical) may share some of the same phenotypic traits due to sharing the same uterine environment, identical twins will have more similarities in their physical appearance because they have the same underlying genetic code. The chorion and placenta are structures related to the development and nutrition of the fetus but do not directly contribute to the genetic similarity between twins.

Identical Twins May Resemble Each Other More Than Fraternal Twins