Do identical twins share 100% of their DNA? Not always. One study found that 15% of identical twins have some genetic variations due to mutations – that is, changes in DNA.

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Tamara Vanderent, 30, revealing that her twin daughters are identical twins rather than fraternal twins. ... I think it's nice for the girls to know if they share 100 percent DNA," she continued.

Identical twins, on the other hand, form within the same egg that splits into two, which results in the two individuals having similar, though not exactly the same DNA.

Naturally I matched the twins as sharing 50 percent DNA as their mother, but the twins also matched each other as genetically being 'self / identical twin' as they shared 99.9 percent DNA." Hassan ...

"They are technically known as quaternary twins," Briana Salyers said. "So they, because they are genetic brothers and they were born less than 9 or 10 months [of] each other.

This results in twins that look very much alike, but they share about 75% of the DNA, unlike identical twins who share 100% or fraternal twins who share 50% of the DNA. Vanishing twins.

Identical twins married identical twins; their babies have the DNA of siblings, a phenomenon known as quaternary twins. “We didn’t have any interest in dating twins.