Bald?

Discussion of everything related to the Theory of Evolution.

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pankaaj
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Bald?

Post by pankaaj » Fri Mar 31, 2006 10:53 am

Why did human hair coat go off in course of evolution?
Take it with a pintch of salt!

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nugget
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Post by nugget » Fri Mar 31, 2006 12:03 pm

aha very interesting

there are soo many possibilities i reckon starting with just being a mutation that could have served to b favourable to an environment or climate change could have affected this over loooooooooooooooooooong period of time. i think a big factor coulc also be non random mating. Perhaps the less hairy individuals were being preferred?
i think hormones have a lot to do with it as well dont they? i dont know too much but i know that in the pineal gland that allows us to distinguish seasonal and daily cycles as well it can signal for your body hair for example to grow thicker in colder weather?

But even if you notice, probably because you are covered up with more clothes , for example leg hair takes longer to grow back in winter than in summer why dont u experiment and see :P Always covering up could have an effect maybe,
i say its a variety of factors and not necessarily natural selection that could of made the less hairy human race fitter than the ones with a hairy coat.

Well thats what i gather :-)

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Post by kiekyon » Fri Mar 31, 2006 1:08 pm

there might be a simpler explanation.
human are able to provide warmth by wering clothes making fire, etc
so, they dont really need hair

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nugget
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Post by nugget » Fri Mar 31, 2006 1:19 pm

yeh i dont need the hair on my legs, but why does it keep growing? :P :lol:

i do have the tendency to complicate simple things :oops:

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mith
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Post by mith » Fri Mar 31, 2006 3:10 pm

It's probably favored because it's cleaner. It's harder to hide lice when you're bald.
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Nithin
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Post by Nithin » Sat Apr 01, 2006 2:28 am

Vestigial organs (Hope the spelling is right) are those organs which were once useful to organisms but in course of time due to their reduced activity have lost their significance. Hair itself ( I dunno about hair coat) is considered as a vestigial organ. Previously all animals (including humans; after all man is a social animal) had hair all over their body to protect themselves from cold and other environmental stuff.
In course of time humans began to wrap clothes around their body and they lost the use of hair and so hair content reduced in the course of evolution and now it is not as fuch as it was in the begining.
There is a lot to do with monkeys and humans in the evolution chart. So we can quote the example of monkeys. Monkeys don not wear clothes so they still have hair growing all around their body!!! :mrgreen:
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Post by Khaiy » Sat Apr 01, 2006 3:40 am

A more specific explanation (although you are right, Nithin) is that before clothing body hair had survival value. Those who didn't have it in colder climates would die out, and so only individuals with hair-producing genes would survive to reproduce. But with the advent of clothing, body hair no longer was a necessity to survival, which would make it possible for individuals without it to survive to reproduce. That's where what mithril said could come in. And the reason that people have any body hair at all anymore is unknown, but it's possible that not enough time has passed since the introduction of clothing for the genes to disappear.

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