You have your dad's hazel eyes, your mom's propensity to tear up at dog food commercials, and your grandma's wit—the apple doesn't fall far from the tree, as they say.
While most of us can all pinpoint physical features, personality traits, and health history to one family member or another, not everything is set in genetic stone. A little refresher: We inherit two copies of every gene, one from Mom and one from Dad. Sometimes those pairings directly cause an outcome, like your blood type. Other times, environmental factors and lifestyle habits might help tip the scales toward the influence of your genes, making the genetic outcome not quite so obvious, says Lily Servais, senior genetic counselor at the genetic testing company Color Genomics.
Here are a few of the more surprising health conditions you can inherit.