Mystery #4Tier 2identical twins / shared DNA
Why do identical twins look exactly alike?
Most brothers and sisters look different even though they share the same parents, because every child gets a freshly shuffled mix of genes. But identical twins break the pattern completely. They can be so alike that even their own family mixes them up, and a phone might unlock for the wrong twin's face. If every person is supposed to be a unique shuffle, how do two people end up with the very same one?
Your guess
How can two separate people end up with exactly the same genes?
There's no single magic word to type, have a go in your own words, then reveal the answer to see how close you got.
Make a guess to unlock the hints and the answer.