why do we have hair on our heads
Not everyone has agreed with Darwin. The first dissenter was no less than the naturalist Alfred Wallace, who simultaneously proposed the theory of evolution by natural selection. But Wallace could not believe in evolution by sexual selection and, acknowledging that head hair serves no physical function, he concluded that it confirmed the existence of God. Only His mysterious ways could account for human hair. No one can "prove" or "disprove" these assertions because they are almost impossible to test experimentally. Darwin, for example, inverted his argument to account for human nakedness. We are unique among monkeys and apes in having lost our bodily hair, and we suffer because fur protects animals against trauma and sunburn. But Darwin, noting that every human society, however primitive, invariably paints, tattoos, pierces and otherwise decorates its bodies, argued that, in the remorseless competition for sexual partners, we humans, during the evolutionary past, shed our hair to create a canvas on which to flaunt our creativity, flair and beauty.
People really care about their appearance, and those who lose their hair may contemplate suicide. Last Thursday, the courts awarded бе4,000 to Linda Elt, 53, for a failed perm that turned her into a recluse. A human vanity so profound can be explained only by an evolutionary moulding as profound, or by God. But we academics distrust divine invocations. When, in his 1857 Omphalos, Philip Gosse proposed that God had created the fossils to test our faith, few of his fellow scientists, however religious, believed him. We scientists look for material answers to material questions. No one will ever fully know if Darwin was right over sexual selection, but, in his arguments with Wallace and others, we see greatness at work.
In a century's time, people will still debate their points. By then no one will care that a sanctimonious sophist called Tony Blair, while affecting to disavow "personalities" for "issues", once placed Margaret Thatcher's hair on William Hague's head to cajole a few cheap votes.
Ancestral facial hair. Our closest ancestors, the chimpanzee and bonobo, both grow facial hair around the mouth area. What is noteworthy is that this is the case in both males and of the species. Female chimpanzee with facial hair: Dichotomy of facial hair in humans. Our own species has a notable dichotomy in facial hair between males and females. I'm interested in what broadly speaking are the theories on facial hair. Could it be as simple as sexual selection over tens, or hundreds of millennia? A eludes to a sexual selection direction, but my question is primarily why do human females not grow nearly as much facial hair as their male counterparts?
Is this just a typical sexual dichotomy? I suppose here I am interested at a molecular level - is beard growth absent, or suppressed in women? Speaking physiologically is a hormone that drives hair growth and this hormone is more prevalent in males. Although females do have vellus hair coverage on their face, the thicker androgenic hair isn't typically present. A cursory search didn't reveal to me if this is due to less follicles in the first place so androgen would have little effect, or less hormone release. What is the point of facial hair? (If there is any beyond sexual selection. ) What selected thick androgenic facial hair out of human females? At a molecular level, have females lost the "facial hair gene", or gained a "facial hair suppressor gene"?
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