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Originally posted by Hellhound604
Originally posted by intergalactic fire
reply to post by Hellhound604
So, evolution in humans, these days, has nothing to do anymore with natural selection?
To say it in a different way.
No, not at all. I would say that humans are steering evolution in another way, maybe making us too dependent on modern stuff, like medicines, and making us perhaps too dependent on those. For example, take our dependance on antibiotics. There is a predator-prey adaption going on in nature, google "red queen hypothesis", in which any organism and its parasites keep on evolving just to keep pace. Now we use antibiotics, and kill of most of the bacteria, except the ones that are immune to this antibiotic. Now bacteria breeds incredibly fast, and within a couple of generations you have mostly bacteria that are immune to this antibiotic, and all of a sudden, the old antibiotic doesn't work anymore. It gets even worse than this, different types of bacteria can exchange nuclear material (bacterial conjugation), and some of it might be that part of the DNA that enables the other type of bacteria to be immune against that antibiotic, and guess what, all of a sudden, the new type of bacteria acquires immunity too. The bacteria keeps on adapting, so we vastly accelerate their evolution, and in the mean time, our own immune response does not undergo this accelerated adaptation....... the same applies to GM foods.......
Sickle cell anemia is another example. In countries where sickle-cell trait is endemic, they also have a high incidence of malaria-carrying mosquitoe's. Yet most people with sickle-cell trait anemia is not nearly as effected by the malaria-parasite as people that don't have that disease. (Cickle-cell anemia occurs when the gene is present both genes. In people with sickle-cell trait, it is only present in one gene, the other gene still express normal hemoglobin)Yet, we want to get rid of sickle-cell anemia, which is exactly what is needed for immunity against malaria. No, we rather want to poison vast areas with pesticides and choose to forget that natural selection drives everything.
but enough peeving, guess I need to start giving references :
sickle-cell anemia and malaria : sickle.bwh.harvard.edu...
bacterial conjugation : en.wikipedia.org...
red queen hypothesis : en.wikipedia.org...
edit on 17/5/2011 by Hellhound604 because: explained sickle-cell a bit better
Originally posted by intergalactic fire
reply to post by SG-17
well you ask it polite, i would say no
And...edit on 17-5-2011 by intergalactic fire because: (no reason given)
Originally posted by intergalactic fire
Why is the evolution of bacteria happening so fast? it only needs some generations to adapt to antibiotics.
But humans need thousands of years?
Originally posted by intergalactic fire
Originally posted by Hellhound604
Originally posted by intergalactic fire
reply to post by Hellhound604
So, evolution in humans, these days, has nothing to do anymore with natural selection?
To say it in a different way.
No, not at all. I would say that humans are steering evolution in another way, maybe making us too dependent on modern stuff, like medicines, and making us perhaps too dependent on those. For example, take our dependance on antibiotics. There is a predator-prey adaption going on in nature, google "red queen hypothesis", in which any organism and its parasites keep on evolving just to keep pace. Now we use antibiotics, and kill of most of the bacteria, except the ones that are immune to this antibiotic. Now bacteria breeds incredibly fast, and within a couple of generations you have mostly bacteria that are immune to this antibiotic, and all of a sudden, the old antibiotic doesn't work anymore. It gets even worse than this, different types of bacteria can exchange nuclear material (bacterial conjugation), and some of it might be that part of the DNA that enables the other type of bacteria to be immune against that antibiotic, and guess what, all of a sudden, the new type of bacteria acquires immunity too. The bacteria keeps on adapting, so we vastly accelerate their evolution, and in the mean time, our own immune response does not undergo this accelerated adaptation....... the same applies to GM foods.......
Sickle cell anemia is another example. In countries where sickle-cell trait is endemic, they also have a high incidence of malaria-carrying mosquitoe's. Yet most people with sickle-cell trait anemia is not nearly as effected by the malaria-parasite as people that don't have that disease. (Cickle-cell anemia occurs when the gene is present both genes. In people with sickle-cell trait, it is only present in one gene, the other gene still express normal hemoglobin)Yet, we want to get rid of sickle-cell anemia, which is exactly what is needed for immunity against malaria. No, we rather want to poison vast areas with pesticides and choose to forget that natural selection drives everything.
but enough peeving, guess I need to start giving references :
sickle-cell anemia and malaria : sickle.bwh.harvard.edu...
bacterial conjugation : en.wikipedia.org...
red queen hypothesis : en.wikipedia.org...
edit on 17/5/2011 by Hellhound604 because: explained sickle-cell a bit better
Why is the evolution of bacteria happening so fast? it only needs some generations to adapt to antibiotics.
But humans need thousands of years?
I just read an article on the 35 years fruitfly experiment, can someone clarify this what they concluded?
The only thing i got from this, is that things happened that they didnt expect or gone the way it should be?
And they point out some things that may be the cause?
Originally posted by korath
There's still apes because the aliens only changed some of our ancestors into more modern humans. The apes they didn't catch just stayed in the wild and remained apes. Sorry if this already got said, I don't feel like reading all 110 replies..
Originally posted by philware
reply to post by madnessinmysoul
get a grip will you mate
Originally posted by intergalactic fire
reply to post by MrXYZ
Those few links should proof our evolution? If you call a footprint here and a bone there proof?
You gonna have to do better to convince me.
A slow process means slow or small changes in generations? So there should be more proof than.
Originally posted by intergalactic fire
reply to post by healthysceptic
More than 1 would be nice.
The ones they found were just mutations, IMO