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How come some identical twins are one male and one female?

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Identical twins come from a single fertilized egg that splits into two. Before it splits, it is either male or female. After it splits, there are either two males or two females. Both parts of the fertilized egg implant in the uterus and each produces one of the twins. Identical twins have the same genetic origin. read more

Identical twins come from a single fertilized egg that splits into two. Before it splits, it is either male or female. After it splits, there are either two males or two females. Both parts of the fertilized egg implant in the uterus and each produces one of the twins. read more

Identical twins share the same DNA and started from the same egg and sperm; fraternal twins come from two separate eggs that have been fertilized by two separate sperm around the same time. Since they have the same parents, they may have a similar appearance, but they are not genetically identical. read more

As the word identical means: identical! thus must be of the same gender. There are fraternal twins and that can be either gender or one of each. read more

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