Question: What is the weirdest story that you have ever heard

Natalia Brodaczewska answered on 17 Mar 2020:

Sometimes when we do tests in the lab, we can find some unusual things that we didn’t expect or think about. Like if we test a woman, we don’t expect to see any Y chromosome which only men should have. But sometimes people can have an extra Y chromosome even if they’re a woman and sometimes we may find out that they used to be a man but went through a gender change. So DNA can give us lots of information about a person. Sometimes we can find that people aren’t related to each other when they thought they were. Or that identical twins don’t actually have identical DNA – I was very surprised when I found that out!