stevevw
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The weasel word you talk about come from the scientists not me. None of the papers I have looked at have a specific number. But they mention most or majority so I would say its not all genes but the majority have come from HGT in micro organisms. As for more complex creatures this is harder to determine at the moment. But new research is coming out all the time. Once again scientists are not specific with numbers but mention a significant amount of HGT in complex life. One paper does mention that around 50% of genes in humans has been from HGT events. So it certainly isn't a minor thing. But if you notice the other thing that the scientists are saying is that HGT and/or symbiosis/endosymbiosis has been responsible for much of the genetic material rather then evolution via vertical transfer. So the scientists are even telling us this such as Carl Woese who is a atheist and supporter of evolution.Greater capacity than what? What's "very large" in numbers? Same question for "very high"? I see lots of weasel words but no actual specifics. Why is that?
Nevertheless, the number of well-supported cases of transfer from both prokaryotes and eukaryotes, many with significant functional implications, is now expanding rapidly. Major recent trends include the important role of HGT in adaptation to certain specialized niches and the highly variable impact of HGT in different lineages.
The newly revised view is that early organisms constituted a soup of changing genetic entities with promiscuous horizontal (lateral) gene exchange.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1312238/
Initially … lateral gene transfer … was pandemic and pervasive to the extent that it, not vertical inheritance, defined the evolutionary dynamic.
Larger organisms are colonized by smaller ones, and organisms of similar size associate intimately without merging. Genomes have merged and coalesced since the early soup of lateral gene transfer.
Carl Woese
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1312238/
The problem with that is that I have posted several papers and what you perceive as difficulties may not be what I see as a difficulty.Your the one making the claim of difficulty. Its not a guessing game. If you believe there is a difficulty then you should be specific.If you read the paper you were quote-mining from, you'd have an answer.
Put it this way, if there is a category for those who disagree with what is a transitional ie (splitters) and those who dont (lumpers) then the disagreement must be fairly common.What percentage is "a lot"? Please be specific - how many fossils do you believe are miscategorized by scientists?
Given the ongoing battles between lumpers and splitters in the taxonomic community, one wonders whether the discovery of new species isn't just due to the elevation of varieties to the level of species.
http://sandwalk.blogspot.com.au/2009/06/taxonomic-inflation.html
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