Our ancestors were monkey like, with male and female faces covered with hair. Now, adult males grow much more facial hair than adult females.
Is there any concrete biological explanation (or advantage) from this?
Is there any biological explanation why the human female has stopped growing facial hair as males do? Simple. Male members of the savage tribes in ancient times have found that the females are more beautyful if they had no facial hair, so they mated with them rather than with the "bearded" ones. By forced selection, female genotype without facial hair has become more prevalent and spreaded all over the world.
Another fact is considerable - facial hair is needed to preserve the heat of the body (the face and sinal cavities in the scull), when exposed to the severe outdoors conditions. Since female tribe members were supposed to stay in their settlements (caves and other shelters) in time their facial hair has become unnecessary, what has led to the above menitioned choice of males.
Is there any biological explanation why the human female has stopped growing facial hair as males do? just preference on the part of males. males in the past preferred females with less hair on their faces (for whatever reason) so that trait has been selected for and passed down
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the reason was probably that less hair indicates less masculine hormones etc, therefore better reproductive capability.
Is there any biological explanation why the human female has stopped growing facial hair as males do? because of the female hormone progesterone..
Is there any biological explanation why the human female has stopped growing facial hair as males do? the function of hair - to provide warmth. females've got a bit more fat on face than males which keeps them warm.. so is needed by a male.
Is there any biological explanation why the human female has stopped growing facial hair as males do? males secrete testosterone, the male hormone fromt the testes. When you reach puberty this hormone is released in increased quantities, this produices the changes known that males go through such as hair in chest pubic under the arm and facial hair as well. Changes in tone of voice etc. Females on the other hand produice Estrogen hormone that comes from the ovaries and we develop to fully grown women.
so it's these hormones that produice those changes... sometimes women need to take hormones to help with a disease or a condition that they have and start growing facial hair, which I bet is pretty embarasing for them, ever seen a woman with exess facial hair? this might be because of medication that is making her hormones go wild. Make sense now?
Is there any biological explanation why the human female has stopped growing facial hair as males do? According to the theory of natural selection, females lost their facial hair probably because they were less attractive to males. Because females with increased facial hair were less attractive than those with less facial hair, they had fewer mates. Eventually, because they had fewer or no mates, hairy-faced females didn't reproduce and have offspring that carried the hairy-faced trait, hence fewer and fewer young were born that had hairy faces, until finally there were no hairy-faced females.
Now, attractiveness to males may not have been the driving force behind the evolved hairless-faced females. It could have been an environmental factor--hairy-faced females may not have been able to see predators as well, may not have been able to protect their home as well, etc. as hairless faced females.
Also, all female humans still have some facial hair--eyebrows and eyelashes have not lost their function in either sex. Many females also exhibit fine upper lip and cheek hair that would be analgous to the males' mustaches and beards. As a matter of fact, there are very few spots on the skin of the human body where hair can't grow, save for the lips and tongue. Hereditary and hormonal factors tend to control whether or not the hair is evident or grows at all.
Check out an older woman who's gone through menopause. Because they produce excessively less estrogen and progesterone than reproductive-aged females, they begin to get hairy faces.
Is there any biological explanation why the human female has stopped growing facial hair as males do? Sexual selection
It can produce some pretty unusual appearances in women and men...check this out to see how women of other places are different because of sexual selection.
this is a great example of physiological difference that came about because of sexual selection... http://www.heretical.com/miscella/baker4...
