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How are identical and non-identical twins formed?

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To form identical twins, one fertilised egg (ovum) splits and develops two babies with exactly the same genetic information. This differs from fraternal twins, where two eggs (ova) are fertilised by two sperm and produce two genetically unique children, who are no more alike than individual siblings born at different times. read more

The sex of fraternal twins has a chance of differing. Identical twins develop when a single egg fertilized by a single sperm splits to form two different babies. These twins have the same genetic identity. Identical twins are always the same sex. read more

Identical twins form from a single egg that is fertilized and then splits into two. The medical term for identical twins is monozygotic, meaning that they form from a single zygote. Identical twins share 100% of their DNA. But there is a third type that is in-between. read more

To form identical or monozygotic twins, one fertilised egg (ovum) splits and develops into two babies with exactly the same genetic information. To form fraternal or dizygotic twins, two eggs (ova) are fertilised by two sperm and produce two genetically unique children. read more

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