Do some identical twins look different? Created with Sketch. Yes. Not all identical twins look identical. Even though these twins come from the same egg and sperm, and even though they have ...

It makes sense that identical twins would have the exact same DNA, right? Spoiler alert: Not always! Here's why. Identical twins (also called monozygotic or MZ twins) are conceived when a single ...

Identical twins are not as identical as previously assumed, according to a study published today (January 7) in Nature Genetics. Rather than having exactly the same DNA sequences, twins start ...