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Why are there no human apes alive today?

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Author Topic:   Why are there no human apes alive today?
Dr Jack
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From: Immigrant in the land of Deutsch
Joined: 07-14-2003
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Message 207 of 1075 (620979)
06-22-2011 5:39 AM 		Reply to: Message 201 by Portillo
06-22-2011 3:37 AM

Re: More evolved?
Are you saying that we are not more evolved than pond scum?
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I can think of no reasonable grounds to claim that we are more evolved than pond scum on. By most reasonable measures we are either equally or less evolved than pond scum. Pond scum's shorter generation time and larger population sizes mean they undergo more rapid evolution than we do.
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Dr Jack
Member
Posts: 3514
From: Immigrant in the land of Deutsch
Joined: 07-14-2003
Member Rating: 8.3

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Message 1005 of 1075 (626285)
07-28-2011 6:50 AM 		Reply to: Message 999 by ZenMonkey
07-28-2011 12:56 AM

Re: Moderator Advisory
Because HGT doesn't happen between vertebrates.
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This is not strictly true.
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Gene fragments from one species can become incorporated into viruses, or bacteria, get transferred to other species with the infective agent and then incorporated into the genome of the host.
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It's radically less common than in prokaryotes but it can happen and has happened.
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Dr Jack
Member
Posts: 3514
From: Immigrant in the land of Deutsch
Joined: 07-14-2003
Member Rating: 8.3

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Message 1010 of 1075 (626322)
07-28-2011 12:58 PM 		Reply to: Message 1009 by ZenMonkey
07-28-2011 12:23 PM

Re: HGT amongst vertebrates
1. Is there any mechanism that would allow HGT to take place between relatively complex species without the action of an intermediary, as you describe?
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Not that I know of.
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2. What happens to those gene fragments in translation? Do they end up in the same place in the genome of the last species in this chain as they were in the first?
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Extremely unlikely.
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3. Could this happen with anything like the frequency necessary to account for all the exact ERV correspondences we see between, say, humans and chimps?
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Extremely unlikely. And as noted in 2, even if they occurred with sufficient regularity they'd be in the wrong places.
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