How can identical twins, which to my knowledge originate from the same egg and sperm, have different fingerprints and iris patterns?

Question

How can identical twins, which to my knowledge originate from the same egg and sperm, have different fingerprints and iris patterns?

In: Biology

Answer 1

Fingerprints and iris patterns aren’t formed by DNA. They are formed from the conditions inside the womb, such as movements and pressure applies to the developing fingers.