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Evoloution and Humans: Does it stop?

Forums: Science And Math
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cicerone imposter
 
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Reply Sat 18 Dec, 2004 12:19 am
My tools are bigger n your tools. Wink
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Jimi
 
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Reply Sat 18 Dec, 2004 01:53 am
rosborne979 wrote:


I'm not sure what you are saying here, but it seems that you are suggesting that the changes in biological populations between epochs are due to spurts of mutation and selection, but this isn't what happened at all.


Yes, but if you take bacteria, or smaller multi-celled organisms, and propagate them for hundreds and thousands of generations, you still end up with the original organism, with slight deviations.
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Einherjar
 
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Reply Sat 18 Dec, 2004 02:07 am
Take a dog, propagate it for 100 generations selectively breeding for certain traits and against others, and see what happens.

More mutations happen in a human generation than in a bacterial one as human reproductive cells have split many times since conception.
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Jimi
 
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Reply Sat 18 Dec, 2004 02:09 am
But they are still dogs, and we are still humans.
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Einherjar
 
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Reply Sat 18 Dec, 2004 02:10 am
Jimi wrote:
But we are still humans.


For how long have we been humans? Not long in the grand scheme of things.
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Jimi
 
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Reply Sat 18 Dec, 2004 02:11 am
Where is the link to support the theory that we came from lesser primates? Why are our chromosomes so completely different than ANY other primate?
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Einherjar
 
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Reply Sat 18 Dec, 2004 02:12 am
Keep breeding for a few thousand generations and they might not be.
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Jimi
 
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Reply Sat 18 Dec, 2004 02:13 am
Really? Fruit flies have been bred for thousands upon thousands of generations... and sure they've come up with strains that can't fly... but they are STILL fruit flies.
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Einherjar
 
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Reply Sat 18 Dec, 2004 02:15 am
Jimi wrote:
Where is the link to support the theory that we came from lesser primates? Why are our chromosomes so completely different than ANY other primate?


Lots of links are found in the fossil record. And are we so completely different from other primates? I thought the shared genetic material was in the high 90s.
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Jimi
 
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Reply Sat 18 Dec, 2004 02:16 am
Every primate on this planet has 48 chromosomes, except for us.

Where is the transitional species between Homo erectus and Homo sapiens?
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Einherjar
 
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Reply Sat 18 Dec, 2004 02:17 am
Jimi wrote:
Really? Fruit flies have been bred for thousands upon thousands of generations... and sure they've come up with strains that can't fly... but they are STILL fruit flies.


Some domesticated plants have been changed so much due to selective breeding as to preclude crossing with their native counterparts. This makes them a different species.
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Jimi
 
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Reply Sat 18 Dec, 2004 02:20 am
This makes them hybrids and genetic anomolies. This doesn't make them a natural seperate species.
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Einherjar
 
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Reply Sat 18 Dec, 2004 02:22 am
Jimi wrote:
Every primate on this planet has 48 chromosomes, except for us.

Where is the transitional species between Homo erectus and Homo sapiens?


Mutation.

And homo erectus is itself an intermediary. Asking for intermediaries between the intermediaries is useless, If one was found youl'd still be asking fro intermediaries between it and humans, or betwen it and homo erectus.
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Einherjar
 
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Reply Sat 18 Dec, 2004 02:23 am
Jimi wrote:
This makes them hybrids and genetic anomolies. This doesn't make them a natural seperate species.


They can interbreed amongst themselves, but not with their wild cousins. I thought this was the essence of speciation.
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Einherjar
 
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Reply Sat 18 Dec, 2004 02:26 am
What do you propose as an alternative to evolution?

Welcome to the forum by the way. Smile
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Jimi
 
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Reply Sat 18 Dec, 2004 02:28 am
Ok, but even as an intermediary, Homo erectus didn't just one day have a Homo sapiens offspring. The Mutation from one species to another just simply doesn't work that quickly. It doesn't even work in lesser organisms that quickly.
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Einherjar
 
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Reply Sat 18 Dec, 2004 02:31 am
Jimi wrote:
Ok, but even as an intermediary, Homo erectus didn't just one day have a Homo sapiens offspring. The Mutation from one species to another just simply doesn't work that quickly. It doesn't even work in lesser organisms that quickly.


Off course not. The fossil record isn't complete, and It shouldn't be expected to be. Dosn't mean there weren't intermediaries.
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Jimi
 
  1  
Reply Sat 18 Dec, 2004 02:34 am
Just because there may or may not be an alternative to evolution doesn't mean evolution from primates is so. I believe in species adaptation, but I just can't see enough evidence to show that I came from lesser organisms.
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Jimi
 
  1  
Reply Sat 18 Dec, 2004 02:35 am
And thanks for the welcome! Smile
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Einherjar
 
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Reply Sat 18 Dec, 2004 02:36 am
How else would you interprit the evidence?
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