How can a red-head (which is 2 resessive genes) have individual black hairs?

I have red hair. I know this is an oversimplification, but to my understanding there is a set of at least 3 gene sets which deal with hair color. Brown/blond (blond recessive) non-red/red (red recessive) and a set dealing with how dark the color is (all dark makes black hair)

My mother has blond hair (Bl-Bl/Nr-R/20% dark), my dad has black hair (Br-Br/Nr-R/100% dark) I ended up inheriting both resessive reds to end up with a copper-red hair (Br-Bl/R-R/60% dark) Yet a few of my hairs on my arms, or legs grow in pitch black. How does this happen? Is some of my cells dna actually slightly different than other cells?

How can a red-head (which is 2 resessive genes) have individual black hairs?

all of ur DNA is the same in every cell of ur body, if not u wouldnt b human, the difference is that a diff part of ur dna may control the hair on ur arms from the gene that controls the hair on ur head... to put an analogy its like buying a red toyota, then saying "why is the interior black?, shouldnt it b red?"... dont know if that helps or hurts, lol.

How can a red-head (which is 2 resessive genes) have individual black hairs?

no one's hair is all the same color, we all have several different shades on our heads. My husband's hair is very dark brown, almost black, but out in bright sunshine I see a lot of red in it.