Can You Roll Your Tongue Like This?
Can you roll your tongue like this? (Click on the picture to see the full image.)
If you can, chances are one or more of your family members can too. This trait along with other characteristics like blue eyes, curly hair and lactose intolerance, is inherited or built into your genes and passed on from one generation to the next.
While some inherited genes code for severe and sometimes lethal genetic disorders, others can give insight into the workings of the human body in ways that would amaze you.