I also thank all the responders to my recent query--I am sure it will generate many more questions in our future than answers, which is the only way we learn.
Debbie
>>> Paul Mikkelsen <[log in to unmask]> 7/10/2007 8:56 PM >>>
Thanks to all respondents for "clarification" ...which has led me to a much more enhanced understanding of how little I know.
Contrary to DNA being perceived by the general public as an "exact science" with definitive answers to all life-questions, a picture of variability, uncertainty, and a lack of comprehensive genetic knowledge has just been painted... in spite of recent great advances.
I sometimes wondered what life would be like in the distant(?) future, when sequences of all species had been determined and compared and questions regarding molluscan (and other) taxonomy, classification, evolution, etc. had long since been answered definitively and the "lumpers" and "splitters" saw eye-to-eye on these issues. Thankfully, because this is fun stuff which should challenge (be enjoyed by) generations to come, I now really don't see it happening.
I very much appreciate all your time for the great responses,
Thanks,
Paul
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Deborah Duval wrote: Thanks, Doug.Debbie Stemke Douglas <[log in to unmask]> 7/6/2007 6:13 PM >>> I'm not that person, but can certainly answer part of the question. There are a few cases at least in humans, where 'different parts of the anatomy' could result in different human DNA. First many immune cells are the results of rearrangements and deleations so technically they are different (T-cells and B-cells anyway). Obviously sex cells, the results of meiosis, will have 'different' DNA as a result of recombination and reduction in the chromosome. The third one is rare, but in a VERY few number of human Chimeric individuals are known to exist, apparently one individual the result of a fusion between, what I would guess are two fertalized eggs. These individuals will have two completely different types of DNA from different tissues. Otherwise the remainder of the DNA should be the same. Don't know if that helps. DougDeborah Duval <[log in to unmask]> wrote: Sorry to revisit this thread, but would whomever posted the comment about DNA from different parts of the anatomy of a given animal yielding different results, and therefore not necessarily solving all of the specie delimna, please show yourself so that I can pursue this a little further privately.Thanks.Debbie [log in to unmask] - a forum for informal discussions on molluscsTo leave this list, click on the following web link:http://listserv.uga.edu/cgi-bin/wa?SUBED1=conch-l&A=1Type your email address and name in the appropriate box andclick leave the list.-------------------------------------------------------------------------------------------------------Choose the right car based on your needs. Check out Yahoo! Autos new Car Finder [log in to unmask] - a forum for informal discussions on molluscsTo leave this list, click on the following web link:http://listserv.uga.edu/cgi-bin/wa?SUBED1=conch-l&A=1Type your email address and name in the appropriate box andclick leave the list.---------------------------------------------------------------------- ---------------------------------------------------------------------- [log in to unmask] - a forum for informal discussions on molluscs To leave this list, click on the following web link: http://listserv.uga.edu/cgi-bin/wa?SUBED1=conch-l&A=1 Type your email address and name in the appropriate box and click leave the list. ----------------------------------------------------------------------
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