Research on variation in human hair colouration has shown that mutations in genes that are involved in the synthesis of melanin pigments are largely responsible. Chimpanzee wearing spectacles Photograph: As regards natural selection, depigmentation allows greater penetration of the skin by ultraviolet B UVB , which is needed to synthesise previtamin D3. Colour mutations can only proliferate in populations if they are seen as desirable and are sexually selected for. Unfortunately he was unable to find enough data to support his theory that blonde hair is sexually selected and had to drop the subject.
It has been suggested that as a result this was a time of intense sexual rivalry between females due to their numbers exceeding those of males. Chimpanzee wearing spectacles Photograph: Northern Europe has fewer hours of sunlight compared with Africa, so the theory is that tribes migrating into Europe underwent a genetic mutation that resulted in the depigmentation of skin and hair. In addition, before bottles of hydrogen peroxide became available, blonde hair in females could be interpreted as an honest signal of youth and therefore reproductive fitness. Ten years after he published On the Origin of Species in , Darwin started to research the sexual selection of blonde hair in women in preparation for his book The Descent of Man and Selection in Relation to Sex , which was published in For a female to choose a blond male he must be able to deliver resources mammoth , as his blond hair alone is not enough to turn her on. These hunting trips were dangerous, resulting in many fatalities. This is because postmenopausal women rarely retain the flaxen locks of their youth, of course eventually becoming grey grannies. There are higher numbers of females born blonde than males and retention of blonde hair into adulthood is a sexually selected indicator of fitness in females. The theory is that when given the choice, Pelaeolithic males chose blondes, who stood out from their rivals. In northern Europe, however, where ice covered much of the terrain, people were dependent on meat. Blondes do not seem to have lost any of their popularity since the end of the last ice age. But in some parts of the world, such as central Africa, mutations that result in albinism or a significant depigmentation of a baby can provoke fear and superstition and sometimes even infanticide. Interestingly, Aboriginal tribes have evolved blonde hair in females independently of the Nordic blonde. Blonde hair is almost certainly a sexually selected trait in women. Research on variation in human hair colouration has shown that mutations in genes that are involved in the synthesis of melanin pigments are largely responsible. The genes for blue eyes and blonde hair are recessive, meaning both parents must have the genes for them to be expressed in their offspring. This seems to be true of a lot of men. Individuals with lower levels of a melanin pigment called eumelanin are likely to have blonde hair. As regards natural selection, depigmentation allows greater penetration of the skin by ultraviolet B UVB , which is needed to synthesise previtamin D3. Bands of men went in search of herds of prehistoric bison or mammoth. Late Palaeolithic females in southern Europe and Africa could forage for food and feed themselves and their infants, with males occasionally supplementing their diet with meat. Blond hair in males does not correlate with oestrogen levels as it does in females and blond hair in males is not a known indicator of fitness as it is in females. It has been theorised that the blonde hair and blue eyes seen in Caucasians are recent adaptations, dating from approximately 11, years ago. This would also help to explain the existence of blond males. Today there are plenty of theories about the evolution of blonde hair and the science of genetics has furthered the debate.
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