There's any number of explanations, take your pick.I do favor the Aquatic Ape combined with Population bottleneck theory, as it provides simple & common explanations for multiple morphological peculiarities of human race, not just the lack of fur.
Yeah I like the Aquatic Ape theory, but I know it has little to no support and not being an expert I'll defer to them.
Observations rejected "aether" a century (!) agoThe whole AWT just begins with description of imbecility of physicists, who cannot realize, that the motion of any environment is undetectable with its transverse waves. You're apparently unable to intercept this information, despite I explained it many times here. You're like the religious troll, who just repeats "But Bible describes it differently".
Physics as such has little to do with biologyThe thermodynamics is routinely applied just to evolution. And the thermodynamics is best described with Boltzmann gas.
Wildfires and their frequency are a product of climate(lightning, aridity, precipitation), and so are insects. That's why it's hard to rule out climate. It affects a lot
where open C4 grasslands abruptly transitioned to closed C3 forests within several hundreds to thousands of years. Carbon-isotopic signatures correlate most strongly with Earth's orbital geometry (precession), and tropical sea-surface temperatures are significant secondary predictors in partial regression analyses
So much for environmental factors driving evolution.
With so much change going on today
Those who posit wildfire theory et al seem not to understand that it is the availability of nutrients and their metabolism to pheromones that is responsible for divergence in species from microbes to man
There are many other possible reasons for species adaptation, including pure random chance, or one tribe killing off all the other tribes, etc.
Human evolution is a real puzzle to me for several reasons.
Every other mammal dwelling on land above ground has a significant coat of hair or fur. Can the time from the development of clothing have been long enough for us to have evolved (essentially) hairless? (and I know, the folicles and tiny hairs still mostly exist). Hairlessness is normally an adaptation to living in water. Were our ancestors at some point sea creatures?
I'd love to learn more about adaptive evolution by random chance so the model (if any) could be compared
in a model where individual survival is nutrient chemical-dependent and reproduction is controlled by pheromones
Human evolution is a real puzzle to me for several reasons.
Every other mammal dwelling on land above ground has a significant coat of hair or fur. Can the time from the development of clothing have been long enough for us to have evolved (essentially) hairless? (and I know, the folicles and tiny hairs still mostly exist). Hairlessness is normally an adaptation to living in water. Were our ancestors at some point sea creatures?
Errors in genes are random, and can be passes down genetically. If such an error becomes widespred it can become a common trait in a species.
...the 'recessive' genes for "albinism' and for 'baldness' have been around for millennia.
JVK:
Explain the evolution of citrate metabolism in Richard Lenski's E. coli experiment in the context of "nutrient chemical-dependent pheromone-controlled" evolution.
How does chromatin remodeling relate to the introduction of novel genes?
Yeah I like the Aquatic Ape theory, but I know it has little to no support and not being an expert I'll defer to them.-
Ask the question in the context of my model, and I may answer it. If you want to debate nutrient chemical-dependent pheromone-controlled adaptive evolution,provide an alternative model for de novo gene expression and receptor-mediated behavior. I think what you're asking is for an explanation of someone else's work, so you can ignore mine.
Obviously, not all evolution can be due to environmentally-induced gene modification because there's no top-down mechanism for the creation of novel enzymes.
A bacteria can't just detect citrate and magically reverse engineer the gene for citrate lyase. Either the E. coli got it through hor. gene transfer from a contaminant or it evolved it de novo.
A bacteria can't just detect citrate and magically reverse engineer the gene for citrate lyase. Either the E. coli got it through hor. gene transfer from a contaminant or it evolved it de novo.
Why must there OBVIOUSLY be top-down mechanisms for the creation of novel enzymes?
I see the picture more as an epigenetic tweaking of immense gene networks as detailed in my model.
Where does your either/or statement about E. coli and hor. gene transfer from a contaminant or de novo gene expression come from?
It seems that maybe...just maybe...aroc91 was being facetious...possibly testing you.
I guess I just need clarification. Are you proposing a guided, top-down approach to new genetic information as opposed to the selection-driven, bottom-up mutation/natural selection approach?
I see the picture more as an epigenetic tweaking of immense gene networks as detailed in my model.
How does epigenetic tweaking result in a novel phenotype? In your model, how does the presence of citrate in a media influence the evolution of citrate lyase epigenetically?
You keep saying the same thing over and over without any further explanation and expect people to completely understand you.
...we've known about chromosomal genome mutations leading to rRNA active site modification for quite some time?
How does the presence of the substrate create the necessary gene?
So, essentially, you're describing quorum sensing? That's perfectly valid.Where does the validity of nutrient chemical-dependent pheromone-controlled reproduction (i.e., quorum sensing) end and mutation-driven adaptive evolution begin? Is there a model for that?
How does that result in new genomic information though?
How does that mesh with the fact that we've tracked chromosomal mutations responsible for the emergence of drug resistance.
The mutation that resulted in the evolution of the well-known peppered moth from its original wing pattern to the darker pattern has even been identified.
Was the mutation automagically driven, or was it nutrient chemical-dependent and pheromone-controlled as is species divergence from microbes to man?
So DNA replication errors are only due to some ulterior, epigenetic, reverse engineering, pheromone-driven motives?
How does a cell direct mutation with certainty in what that mutation will result in?
That seems just as automagical to me as random mutation/selection does to you. Berkeley's on my side, by the way.
http://evolution....om.shtml
Wow... Say THAT 10 times real fast...
Where is the required rapid evolutionary change we should be seeing in the present? There should be extremely high rates of change and failure visibleOnly if the world were 6500 years old as you seem to think.
Languages evolve slowly or quickly depending on a number of factors. Dialects change until they can no longer be understood by the original speakers
Anyone who can grasp that "take home message" should help to convey it to the folks at Berkeley or anywhere else where people are taught anything else
There should be extremely high rates of change and failure visible
Only if the world were 6500 years old as you seem to think.
Animal populations diverge until they can no longer interbreed, and so become distinct species.
You may as well stop arguing with JVK. He's either a serious crackpot or he is trolling you. I laughed my @$$ off at this one:Anyone who can grasp that "take home message" should help to convey it to the folks at Berkeley or anywhere else where people are taught anything else
I had already figured out that he was probably trolling us, but that one sealed it for me.
Languages change in response to food supply-driven social-interaction which can be observed in all communications between living organisms from bacteria to man.
Sorry, just having fun with JVK's 'theory'. lol.
Just say "quorum sensing". That model of nutrient chemical-dependent pheromone-controlled reproduction extends across species from microbes to man.
Just say "quorum sensing". That model of nutrient chemical-dependent pheromone-controlled reproduction extends across species from microbes to man.
No matter the name, the rose still smells as sweet...:-)
JVK, I'm not a biologist, and I didn't go to Berkley. I studied aerospace at Auburn. That being said, I don't need to be an expert to know BS when I see it.
JVK
Dec 24, 2012I read about that somewhere; no wait... I published an article that detailed the molecular mechanisms of how it (i.e., adaptive evolution)occurs.
Kohl, J.V. (2012) Human pheromones and food odors: epigenetic influences on the socioaffective nature of evolved behaviors. Socioaffective Neuroscience & Psychology, 2: 17338.
Open access: http://dx.doi.org...i0.17338