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Can a male and a female twin be identical, not fraternal?

April 26, 2017baby female fraternal Health identical Male multiples pregnancy Twin twins

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Can a male and a female twin be identical, not fraternal?

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Fraternal twins come from 2 different eggs fertilized with 2 different sperm. They have completely different DNA, and so are not “identical”. Identical twins come from a single fertilized egg that split into 2 embryos. These embryos normally have the same genes, but genetic errors can occur. The cases you are talking about come from a fertilized egg that started out as male (XY). After the split, one of the embryos loses the Y chromosome. This causes the embryo to develop as a girl. There are other symptoms of this genetic disorder. It is possible, but it is very rare. Identical twins are not always identical, due to these genetic errors during development. The link below has more info. I hope this helps. Sources: http://www.multipletreasures.com/facts-about-identical-twins.