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Author Topic:   DNA similarity between Chimpanzee and Human 70%
RAZD
Member (Idle past 829 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 10 of 32 (719984)
02-19-2014 2:03 PM
Reply to: Message 8 by Taq
02-19-2014 1:26 PM


intentionally misusing science
The main thesis of the creationist paper falls apart once you understand the underhanded tricks that they use to get their 70%. To the uninitiated, it may seem like a subtle difference, but it isn't. The author uses a non-gapped alignment.
That was my first suspicion, the second would be ignoring reversed sequences that still accomplish the same functions.
The author of the creationist paper has rigged the methodology to ignore gaps, and therefore return a false result.
We have seen this type of intentionally misusing science in other areas, such as carbon 14 dating and living animals (seals at McMurdo Sound, etc), and several other dating methodologies.
No surprises.

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This message is a reply to:
 Message 8 by Taq, posted 02-19-2014 1:26 PM Taq has replied

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 Message 11 by Taq, posted 02-19-2014 2:49 PM RAZD has seen this message but not replied

  
RAZD
Member (Idle past 829 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 16 of 32 (720014)
02-19-2014 4:35 PM
Reply to: Message 13 by Telesto
02-19-2014 4:03 PM


Re: One word: Gaps
Hi Telesto, and welcome to the fray.
First of all. There is no ONE result number. The algorithm compared about 650000 sequences with about 400 million bases in summary (Human Y is 60 million bases long, Chimp Y is about 20 million bases long). So compared sequences overlaped many times. I also got mismatch bases. Each sequence had (in my case) percentage identity, sequence length and number of mismatch bases. For example:
97.3% 4552 105
My guess is that the algorithm is similar to other matching algorithms (such as tree rings) ...
So they take one as the baseline and then compare the second one starting with matching both at one end and then shifting the second one along the first one base at a time, recording the degree of matching for each step.
The DNA likely has a lot of regions that were duplicated and then modified, so those would produce matches with lower percentages.
Enjoy
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we are limited in our ability to understand
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Rebel American Zen Deist
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This message is a reply to:
 Message 13 by Telesto, posted 02-19-2014 4:03 PM Telesto has replied

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