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Family trees + Evolutionary pressures

Discussion of everything related to the Theory of Evolution.

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Family trees + Evolutionary pressures

Postby stelaz_reitom » Wed Oct 12, 2005 6:56 am

Hello,
I just have a few questions on evolution..
What is the new evidence is there to change the way we draw our family trees?
And
What evolutionary pressures have led to humans evolving to what they are now?

Thank you..
I find evolution very exciting and i am just wondering on these few things...
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Postby MrMistery » Wed Oct 12, 2005 6:15 pm

From what point of view? there was no pressure for humans to evolve like this, it is simply that man discovered he can survive better by making tools. As for brain size etc, that is all mutation and natural selection...
"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 shashank_hi » Sun Oct 16, 2005 2:45 pm

Hi
See, evolution is an ongoing process. Think of it this way -

Suppose you have to go from point A to point B (which is towards the west of point A). Now, you could, from point A, go in North, South, East or West directions. But only the direction West will lead you to point B, right?

So, similarly, an organism will have several mutants, but only those which make its survival more comfortable, survive and reproduce. An example, after the photosynthetic organism *evolved* on earth, the amount of oxygen in the atmosphere rose and rose to a dangerous level, since it started killing the anaerobs in the open atmosphere. But, some of them mutated, got a gene to synthesise catalase, and they survived, while the mutants with no effective solution to the h2o2 in them, died.

Evolution is truly very exciting. Hope you enjoy it.
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Postby MrMistery » Sun Oct 16, 2005 4:29 pm

All of us know how evolution works. What i do not know is what does the question that has been asked mean. :D
If you clear up the subject, I am sure we can answer it.
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Postby mith » Sun Oct 16, 2005 7:29 pm

probably the ambiguity from whether we descended from the cro-magnon or neaderthals....
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Postby mpecarevic » Thu Nov 10, 2005 6:46 am

MrMistery wrote:From what point of view? there was no pressure for humans to evolve like this, it is simply that man discovered he can survive better by making tools. As for brain size etc, that is all mutation and natural selection...


What do you mean, there was no pressure? You cannnot be suggesting that humans decided to evolve this way.
The easiest way of putting it would be that the ones who werent adopted to the environment at a particular point in time didn't survive or have offspring.
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Postby iri_black » Thu Nov 10, 2005 7:31 am

I think Andrew is right. There was no pressure to evolve...for humans or for any other specie. It's just a response to the environment for better survival and more efficient reproduction.
:) Just my opinion :)
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