|Pretty Women with Natural Red Hair Caroline Trentini|
Red hair varies from a heavy burgundy through burnt tangerine to shiny copper. It is indicated by excessive levels of the reddish colored pigment pheomelanin and relatively minimal levels of the dark pigment eumelanin. It is related with fair skin color, freckles, lighter eye colors (gray, blue, hazel, green), and sensitivity to ultraviolet mild
Ethnical reactions have mixed from risible to admiration; many typical stereotypes are available regarding redheads and they are often shown as fiery-tempered.
The word redhead has been in use since at least 1510 AD.
Red hair is the rarest natural hair color in people. The non-tanning dermis linked with red hair may have been favourable in far-northern environments where sunlight is hard to find. Scientific studies by Bodmer and Cavalli-Sforza (1976) hypothesized that light skin pigmentation inhibits rickets in colder climates by pushing higher levels of Vitamin D creation and also allows the man or women to keep high temperature better than anyone with darker skin. In 2000, Harding et al. agreed that red hair is not the effect of positive range but of a shortage of bad selection. In Africa, to illustrate, red hair is chosen against because high levels of sun damage untanned skin. But, in Northern Europe this does not occur, so redheads can become more common through ancestral drift.
Estimates on the original occurrence of the currently active gene for red hair people fluctuate from 21,000 to 101,000 yrs ago.
A DNA study has deducted that some Neanderthals also had red hair, however the mutation responsible for this differs from that which triggers red hair in modern humans.
A 2007 article in The Courier-Mail, which specified the National Geographic magazine and unnamed "geneticists", stated that red hair is likely to die out in the near future. Other personal blogs and media sources ran similar stories that assigned the research to the magazine or the "Oxford Hair Foundation". Even so, a HowStuffWorks document tells that the foundation was financed by hair-dye maker Procter & Gamble, and that other gurus had dismissed the research as either losing in evidence or simply bogus. The National Geographic document in fact states "while redheads may decrease, the prospective for red isn't going away".
Red hair is caused by a reasonably rare recessive gene, the expression of which can skip generations. It is not likely to fade at any time in the not far off future.