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Human evolution

Discussion of everything related to the Theory of Evolution.

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Postby Joe44 » Sat Dec 03, 2005 2:44 am

I recently went to the dentist to have my teeth cleaned, and an x-ray I had showed that I have no Wisdom Teeth.
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Postby MrMistery » Sat Dec 03, 2005 3:32 pm

How old are you?
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
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Postby jesstickle » Mon Dec 05, 2005 1:05 pm

I have all four wisdom teeth does that mean I am soon to become obsolete. Will I be over taken by all these superior non teeth individuals? Also it seems to me that evolution is still going about its business it just might act a little slower in humans. If you look at cancer which kills 1 in 4 people in the uk it can still be used as a tool for evolution. yes we can treat it and cure it but it remains that some people are just naturally more immune and they are more likely to breed. I'm sure this can be applied to lots of diseases. I guess it just means humans really only have to evolve disease resistance as all other things we can fix ourselves. just because evolution is invisible doesn't mean it isn't there
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Re: Human evolution

Postby sssallylane » Mon Jun 21, 2010 2:00 am

I think that age plays a factor in the growth of wisdom teeth. You can have them as early as 17 or as late as 25. Some don't get them at all, while others have them, but they become impacted. Normally, they are removed because they can get rotten if food particles somehow find their way between the teeth and the gums, and also because they can affect the alignment of the other teeth.
Last edited by JackBean on Mon Jun 21, 2010 5:39 am, edited 1 time in total.
Reason: spam removed
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Re:

Postby jakesully » Sun Jul 04, 2010 11:24 am

James wrote:Evolution is the idea that a group in a species has something that enables them to more successfully mate and pass their genes on compared to the others in their species. Despite being useless, wisdom teeth and such useless organs such as the appendix would give neither an advantage nor a disadvantage in having offspring.
Why are we getting taller? Does this mean that those who are taller have a better chance of having children? Could it be the case that it is the very short people, nowadays are rarely having children? It could be that our human society is not only stopping evolution in some directions, but also aiding it in others, i.e. very short people are now seen as ‘abnormal’, and therefore have fewer children. Is this an example of cultural evolution?


We're getting taller because we're eating WAY more of everything. A high-protein, high-carb diet leads to rapid and early growth.
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Re:

Postby jakesully » Sun Jul 04, 2010 11:29 am

biostudent84 wrote:Over time all species when left alone will grow larger.


Not true.
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Re:

Postby jakesully » Sun Jul 04, 2010 11:32 am

biostudent84 wrote:Human evolution, like all evolution is a slow, but ever continuous process. Proof that evolution has not stopped in humans is simply described by average height. Within the past 200 years, the average male height has gone fro 5'4'' to 5'10''. Also, today, some humans are being born without wisdom teeth. Since we usually remove them surgically, and do not use them if we don't, it is logical for us to evolve to not grow them. Growing an unused part of the body is a waste of energy.

Kyle


If evolution were the reason, 200 years would be far insufficient for natural selection to work it's magic. Plus, how exactly does increased height improve one's genetic fitness?

You know what has really changed (quite dramatically) in the last couple-hundred years? Our diet.
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Re:

Postby jakesully » Sun Jul 04, 2010 11:34 am

canalon wrote:Just a few words to react to some what I have read here:

Proof that evolution has not stopped in humans is simply described by average height.


I would not take this as a proof. Average height depend on many things, and genetic is probably not the most important in this case. A better and richer diet, well balanced during childhood is probably the best explanation for this.

Becoming taller is part of becoming bigger. Over time all species when left alone will grow larger. It is called the "Red Queen" hypothesis.


You should read SJ Gould (I think the book was called "the full house" in English) about the trend toward bigger organisms. In short its just not true.
As for the Red Queen Hypothesis (found in "beyond the looking glass", the sequel to "Alice in wonderland" by the way) it is not about organism becoming bigger, it is more about co evolution between organisms, and mostly about the role of sex in evolution.

HTH

Patrick


Oh, oops. I guess, in the future, I should read the entire thread, before posting a comment. Upon further reading, it seems you had already made my point, but in a much better way.
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Re:

Postby jakesully » Sun Jul 04, 2010 11:48 am

Wilmer wrote:
Isolation causes speciation, evolution happens irregarless of isolation.


What does evolution do if it doesn't make new species?


"Speciation" is when a single species breaks off into two seperate species. Speciation is not required for evolution to take place. A single species can evolve into a new species, and that is not speciation.
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Re: close but no cigar

Postby jakesully » Sun Jul 04, 2010 11:51 am

geddiknight wrote:evolution never stops. The only difference with humans is that the "fittest" is no longer the strongest or the fastest. We dont need to hunt animals, but open up t the idea that we now "hunt" money. Many will deny it, but money attracts the "best" ie prettiest mates. Look at any seriously rich person. They have a good looking spouce dont they? For males the "fittest" still means "most able to provide", for the female, it is now nothing to do with being well fed (plump) but to do with being healthiest (slim). This is no coinsidence.

I hate this idea, because i am not rich, but it is true. That does not mean that poor people cant have beautiful spouses, it just means that the richer you are, the more likely you are to have a beautiful wife - or if you are female and attractive, you are more likely to attract rich males.

Just like any form of evolution, there is always a large spread as some seriously poor chap may be really good-looking, popular, famous, whatever and get the top eschelon of partner.

ta


Dude, ugly, poor people make way more babies than pretty, rich people. I'm afraid your theory is awash.
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Re: Human evolution

Postby master94 » Mon Jul 12, 2010 3:29 pm

Its not about rich or poor its not about fastest or stronger and its not about isolation either i can prove that everyone here is wrong
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Postby germanager » Sat Jul 17, 2010 2:38 pm

Problem is that people are constantly looking for the way to STOP evolution. Imagine we will extend our lives to million years with the help of the medicine. Pretty much no evolving would happen.

All these funny theories that next thousand years of breeding would led to domination of brownish people with dark hair and eyes are total FALSE. In a hundred years genetic engineering would allow you to change appearance as much as you like, would it be blue eyes and blonde hair in fashion than half of the humanity would take special pill or injection and get to that state.

We will start forcing evolution in next few decades, getting rid of illnesses on genetic level and programming the appearance of kids. You want your child to be shark-like creature to breath with CO and produce O2 - you get it! :)

Future is unknown...
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