why do i have a unibrow? I am the only person in my entire family with a unibrow and this includes my partents grandpartents and great grandparents. Is this genetic or is there some sort of enviromental impact that caused me to get a unibrow. Because I am almost 17 and i noticed long visible thin hairs growing between my eyebrows. Also are unibrows normal or were they created by some sort of genetic mutation.