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Whenever the zygoat (fertilized egg) starts mitosis (cell division) it creates two zygoats. These two zygoats are exactly the same in looks and DNA.

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This is not a probability questions but a biological question and, of course, not all sets of twins are identical.

If the twins are identical, this means that a single fertilized egg split in two before it started developing into a fetus. As a result, both twins have identical genetic information. If they are not identical, then this means that two eggs were in the uterus at the same time and that they were both fertilized separately from one another. Thus they almost certainly have different genetic information.

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13y ago
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Q: Why do twins have identical characteristics?
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