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Identical twins do not share 100% DNA

Monozygotic twins are formed from the same egg and obtain the same genetic material from their parents, but that does not mean that they are genetically identical by the time they are born.

This is because so-called identical twins pick up genetic mutations in the endometrium, and those cells weave new strands of DNA and divide into more cells. On average, twin pairs have different genomes due to an average of 5.2 mutations that occur early in development, according to a new study.

Identical twins do not share 100% DNA

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