Medical conditions. Albinism is a genetic abnormality in which little or no pigment is found in human hair, eyes, and skin. The hair is often white or pale blond. However, it can be red, darker blond, light brown, or rarely, even dark brown.
also this website...
For all those brunettes wishing they were naturally blond, a small genetic change could have made all the difference. Scientists have found that replacing one of DNA’s four letters at a key spot in the genome shifts a particular gene’s activity and leads to fairer hair. Not only does the work provide a molecular basis for flaxen locks, but it also demonstrates how changes in segments of DNA that control genes, not just changes in genes themselves.
check out the website for more info here
http://www.sciencemag.org/news/2014/06/genetics-blond-hair
Also a little extra info
your hair is made out of keratin which is also what your fingernails are made of too it's also the stuff behind he silky sheen, wool bear claws and even horse hoofs, but keratin is not very colourful on its own, but you need one thing, pigment there are these cells in your skin called melanocytes, and these melanocytes create natural pigment... but it comes in two parts, eumelanin and pheomelanin
eumelanin gives hair darker hair and pheomelanin gives hair a lighter colour to its hair...
amazing right?
Nice writing, Meaghan
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