system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why do identical twins have different fingerprints?
gpt
Debunking a popular misunderstanding of DNA:

Your DNA does not contain enough information to describe every single cell and how they should be layed out.  What it contains are patterns.  So for instance, your skin is created by a pattern which says "turn the outer layer of stem cells into skin cells and have them grow until they are so-and-so thick".  The cells themselves grow in semi-random ways as long as they obey the pattern.  The whorls and rings in your finger pads are an example of this.  The pattern of the finger pad is dictated by which cells divided when, and where they happened to be.  With the exact same DNA, you will end up with a different skin pattern every time.  This is true for identical twins, but it is also true for clones (assuming you had the technology to create them).  Even if you grew two clones in identical tanks, the small bits of random chance in the arrangement of cells during development would give them different fingerprints.