Harsh86_Patel, on 29 October 2012 - 07:10 AM, said:
Say 'class transitions' as an index,since you choose to define speciation=reproductive isolation in bacteria.
I choose to define it that way because that is the definition.
Harsh86_Patel, on 29 October 2012 - 07:10 AM, said:
Personal definition of species,i don't have one.But i know that just acheiving temporary reproductive isolation in bacteria (which eventually revert to wild type hence cannot be extrpolated to prove any sort of evolution) cannot be the only index for speciation.Ther is no major morphological change,the bacteria still remains bacteria being identical in almost all aspects but just uncapable of interbreeding with wild type due to delterious negative mutation.
There are very few morphological differences between
Homo sapiens sapiens and
Homo sapiens idaltu; morphology needn't be brought into this. And again, if you're looking for class transitions, I've given you numerous examples already, though you ignored them.
Harsh86_Patel, on 29 October 2012 - 07:10 AM, said:
Other then that there was no Darwinistic principle at work for such reproductive isolation in the experiment,it was a random negative mutation.Extrapolating that to any sort of evolution can just be termed daft without empirical proof to back the claim.(Don't state examples of 'variations' (or so called microevolution) again.)
Evolution needn't be Darwinistic; many evolution experiments dabble in non-Darwinian mechanisms. Artificial selection is a more useful example of experiments in Darwinian principles; though of course his was natural selection (there isn't much of a difference between the two). And again, variation is a subset of evolution; if you consider yourself a "variation" of your parents' combined genomes, then so be it, but you
are evolved from them, by definition. You needn't be a different species from your parents to have evolved. You've ignored my previous explanation of this concept.
Harsh86_Patel, on 29 October 2012 - 07:10 AM, said:
Another creative way to define 'Macroevolution' can be acheived by equating it with the 'extrapolations made by evolutionist' based on variations.So Macro evolution=extrapolations made by evolutionists.
What a meaningless statement. You still aren't giving me any answers.
Harsh86_Patel, on 29 October 2012 - 07:10 AM, said:
An interesting definition that can be alternative to species can be a 'Kind',i.e a group that can interbreed and produce fertile offsprings.(since species is defined as a group of organisms that cannot interbreed,'Kind' can be the positive of the statment.A horse and a donkey are considered to be sperate species but they can reproduce to give mules,so species even now is not a very well defined fool proof concept.
No species is not a perfect concept, because it was established before we understood genetics. It's better now than in Linnaeus' or Darwin's times, but still incomplete, because the concept itself is based on premises in science which predated a great deal of very significant information. Yes, donkeys and horses are different species; yes, they can interbreed. The offspring however, mules, are sterile/infertile. This is a demonstration of the speciation which occurred between horses and donkeys (I've explained this before, and you ignored it, but I'll do it again...). The horse and the donkey are indeed different species, but they are still closely-enough related that semi-viable offspring are possible. Mules, however, are not fully viable organisms; they cannot reproduce, due to the discordance in their genomes caused by the combination of the weakly-compatible gametes of the horse and the donkey. The horse and donkey are descended from a single ancestor species; they are still in the process of diverging from that ancestor, and have not yet reached the point of total reproductive isolation. In a few thousand years, however, provided both populations have not gone extinct, it is perfectly plausible to think that they will have completely diverged, based upon our knowledge of genetics and biology; or, alternatively, something even stranger could happen: namely, that the two species could begin to converge, and mules might become a viable, independent species. One of these possibilities is inevitable to occur; or possibly even both (what if one population set diverged fully, while another population set converged?).
Try to realize it's all within yourself / No-one else can make you change / And to see you're really only very small / And life flows on within you and without you. / We were talking about the love that's gone so cold and the people / Who gain the world and lose their soul / They don't know they can't see are you one of them? / When you've seen beyond yourself then you may find peace of mind / Is waiting there / And the time will come / when you see we're all one and life flows on within you and without you. ~ George Harrison