A
Al_Moritz
Guest
I don’t think we should hijack this more general thread with discussions about specific technical issues. I have linked to websites that discuss them (e.g., fine-tuning).Another huger hurdle to evolution is the fact that getting from the “last universal ancestor”, which was a prokaryote to a eukarote is not an easy tasks given the latter’s susceptibility to horizontal gene transfer as it has no nucleus.
Here is an study whose goal was to understand the nature of the last universal ancestor. It discusses the ominous issue with horizontal gene transfer that would the current model of evolution impossible from a probability standpoint.
“Problematic genes could be removed from the analysis though a fundamental
problem remains [15••]: any site that was free to
evolve over the whole period at, say, 0.5% change per every
million years will become saturated with 20–40 changes per
site. Detecting phylogenetic signal above noise for deep
divergences is thus difficult, making many proteins unsuitable
for such phylogenetic studies [15••]. Other factors
worsen recovery: rate differences between lineages; long
branch attraction; horizontal transfer; unrecognised gene
duplications; changes in nucleotide frequency; and changes
in functional constraints [13,15••,16••].”
google.com.do/url?sa=t&rct=j&q=&esrc=s&source=web&cd=7&ved=0CFUQFjAG&url=http%3A%2F%2Fwww.researchgate.net%2Fpublication%2F222455838_The_nature_of_the_last_universal_common_ancestor%2Ffile%2F32bfe50ca30ba7e15b.pdf&ei=7KAfVOXQFJG1ggSy1IHwAw&usg=AFQjCNEO65WJufxlaQeEkJGTgwS0Sj5fbg&sig2=FSVRsT8Ho7Y6xleJgtbaGQ
All in all what I have pointed out are huge hurdles that have not been addressed with the same rigor that is applied to others areas of science. This is not logical to say the least. I would appreciate your comments .
So let me just briefly address your claim that the mechanisms of evolution as proposed cannot lead to increased complexity. Gene duplication is a routine phenomenon in evolution. Let’s say, gene A’ is duplicated, resulting in two copies of A’. Since one copy suffices for sustained function in making protein A, the other can mutate without much selection pressure. If something useful emerges, we have two genes, A’ and B’, that make two useful proteins, A and B, instead of just one, protein A. Voila, complexity has increased.
Like you I used to think there are huge hurdles when it comes to evolution. Not anymore.