It's basically when a person has one more chromosome than usual. You can find out whether someone has it at birth - but it's quite a visual disease sometimes but you SHOULD NOT diagnose it that way. When it comes to Down Syndrome you have a higher chance or hearing loss and heart defects. You'd need to take a genetic skin or blood test to find whether a person HAS Down Syndrome!
Good luck, rockstar! I hope you pass, and I definitely definitely definitely wish you the best! (:
