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Published in May 2012 in Science, a study of people from the Solomon Islands in Melanesia found that an amino acid change in TYRP1 produced blonde hair.so much so that the term "baby blond" is often used for very light colored hair.Each of the two forms, however, is pronounced identically.American Heritage's Book of English Usage propounds that, insofar as "a blonde" can be used to describe a woman but not a man who is merely said to possess blond(e) hair, the term is an example of a "sexist stereotype [whereby] women are primarily defined by their physical characteristics." The OED also records that blond as an adjective is especially used with reference to women, in which case it is likely to be spelt "blonde", citing three Victorian usages of the term.
Lighter skin is due to a low concentration in pigmentation, thus allowing more sunlight to trigger the production of vitamin D.
The color can be from the very pale blond (caused by a patchy, scarce distribution of pigment) to reddish "strawberry" blond or golden-brownish ("sandy") blond colors (the latter with more eumelanin).
Because hair color tends to darken with age, natural blond hair is generally very rare in adulthood.
An alternative hypothesis was presented by Canadian anthropologist Peter Frost, who claims blond hair evolved very quickly in a specific area at the end of the last ice age by means of sexual selection.
According to Frost, the appearance of blond hair and blue eyes in some northern European women made them stand out from their rivals, and more sexually appealing to men, at a time of fierce competition for scarce males.
In this way, high frequencies of light hair in northern latitudes are a result of the light skin adaptation to lower levels of solar radiation, which reduces the prevalence of rickets caused by vitamin D deficiency.