I always liked red hair on people. It occurs naturally in 1-2% of the human population.
tell me more about this
Sure, it is more common (2-6%) in people from northern or western Europe and less frequent in other areas.
what causes red hair
It is usually caused by people having 2 copies of a recessive allele on chromosome 16.
so it's purely genetic?
That's right. That is why you will usually see families of redheads. The color can vary in he from deep burgundy to burnt orange.