I have no misconceptions.
I never implied there is a single ladder.
I said species can increase in adaptability which means evolve. It doesn't mean there is a single ladder on which species evolve.
It means that the species, after the adapation/change, is able to endure conditions that they couldnt before the adaptation/change. Time provides new circumstance, generation of variety provides new solutions, time selects solutions that work.
No need to paste entire wiki articles, I've read them before as well.
I see life as one big hierarchy as well. Not a ladder. The bush analogy below is quite good in fact.
I guess you didn't read my link so I'll quote it since you quoted that large article. Be warned, I redefine some terms that already have definitions but I am precise.
Life is observed as a phenomena of integrating matter into self-replicating schemas.
Matter is integrated by self-replication itself, so making it a part of the self-replicating schema and increasing its growth rate.
Replicator is a form of matter facilitating a self-replication schema.
Life source is all the specific forms of matter and energy required for sustaining the behaviour of replicators of a specific self-replicating schema.
Life source is represented by nutrients and energy such as the minerals from the soil or the sun, or water from a river-rain or another plant or animal.
Death source represents all the specific conditions and that cause irreparable damage to replicators in terms of facilitating a specific self-replicating schema.
A death source can a difficult obstacle causing injuries, climate-chemical-radiational conditions and also another plant or animal by making it its life source.
The behaviour of the replicator through which it facilitates a self-replication schema can be observed to fall into following categories.
Acquiring is the observed behaviour of the replicator which serves the purpose of acquiring life source in order to replicate.
Avoidance is the observed behaviour of the replicator which serves the purpose of death source avoidance in order to survive to acquire and replicate.
All this doesn't really discern robot replicators from the ones we consider life so we must discern further.
Mutation is observed as a change of the form of a replicator inducing a chance of generating a new self-replicating schema via the newly formed replicator.
In order to reduce risk of all the replicators of a given schema losing replicating ability through spontaneous mutation, it is best set to happen during replication and it is observed to be so in most cases(simple life has methods of exchanging genetic material between replicators, this is a weak violation of this rule with some safety mechanism probably). This ensures that the original replicator will still keep an ability to self-replicate even if the mutated replicator fails to spawn a successful self-replicating schema.
Selection of self-replicating schemas is observed to result from population reduction of those self-replicating schemas whose replicators fail to avoid their death source and is also observed to result from lack of growth of those self-replicating schemas whose replicators fail to acquire the required life source(due to competition or otherwise caused failure).
Evolution of life is observed as increased integration (increased life sourcing) or reintegration (recycling - food chain) of matter resulting from mutation and selection generating new distinct self-replicating schemas over time.
Selection mechanisms as explained cause evolution to generate new distinct self-replicating schemas or replicators that are relatively more successful from old ones in terms of acquiring and/or avoiding in order to replicate.
This means that either:
a) acquiring for replication is relatively sacrificed to provide energy/time for increased avoidance mechanisms and this results in better survival of existing population at the cost of replication or reduced population growth.
b) avoidance is relatively sacrificed to provide for increased acquiring and replication resulting in increased population growth but increased risk to existing population.
It is immediately obvious that increased selection pattern a) results from the self-replicating schema being overwhelmed by its death source while increased selection pattern b) results from the self-replicating schema being overwhelmed by competition for its life source
This is enough to define the basic balances of simple life, but is not what we're after really. As said, complex life was enabled by sexual reproduction and ageing so let us try and explain that now.
The biggest event in evolution is the creation of the eukaryotic cell which features sexual reproduction.
Sexual reproduction spawned a meta entity called gene pool. From the perspective of the gene pool, its replicators refresh it every now and then with beneficial and less beneficial genes..
Sexual reproduction inverted the replicator to become a pawn of the newly evolved organisation of life called the gene pool rather than its own "master".
The organisation of life is upheld by the need of replicators to find each other to sexually reproduce and thus each time make a deposit into the gene pool.
It seems like this is a maladaptation as the replicators need to find each other results in fewer replications, so what is the tradeoff for such an organisation to evolve?
The tradeoff is obviously the gene pool - the organisation itself, but how does it prove to be an advantage for life?
It provides for "conditions" for depositing genes in the pool which keep it filled with healthier genes.
A replicator is forbidden to deposit genes before reaching "maturity". This proves he has minimum function to survive "long enough" to "prove" himself worthy of depositing genes and replicating (could be seen as reward from the gene pool, just to illustrate better how the flow of life flows).
Single cell and even some multi cell eukaryotic life forms preserved asexual reproduction but most didn't due to the following:
As sexual reproduction of cells evolved, asexual reproduction could be "sidetracked" towards building a body of cells. This is the evolution of multicellular life form. A cell divides asexually and coordinated via various mechanisms into a body of differentiated cells performing a different task.
The body of a multicellular life form is simply more evolved acquiring and avoiding behaviour resulting from "hijacking" the now optional asexual reproduction method.
The single cell instead of immediately beginning replication starts to build a body around it that will eventually help it survive to sexually reproduce with another such life form. The multicellular body enables acquiring of new life sources and avoidance of more death source.
The protein guided body development out of a single cell is a complex timed process which can easily go wrong(errors integrate over time), again causing a need to reject undeveloped bodies from allowing them to deposit in the gene pool as a gene that disrupts multicellular body producing processes would prove to be very unhealthy for the future of the gene pool and so the species.
Remember, growing of the body is an evolution of tools support both acquiring and avoiding behaviour. It is in fact an evolution of the old replicating ability - asexual reproduction.
It seems that multicellular life forms invest quite the resource into their acquiring and avoiding behaviour tools. This causes quite a delay in reproduction compared to unorganised life. But the payoff of new life sources and avoidance of death sources seems worthy. The gene pool provides a payoff in terms of providing essential selection mechanisms for this newly evolved behaviour of growing bodies.
The growing bodies are investment into the future ability of a replicator to survive and replicate but how much should be invested? A body could be set to grow indefinitely before allowing time and resources to reproduce instead of growth. This may make it more sturdy in terms of avoidance but if it still somehow dies before replicating all the investment is literally lost. So,
the gene pool needs to regulate time to mature to make sure it gets enough deposits or in other words to make sure its subscribers deposit before a death source gets them but after maturation of the body.
.... there's lots more
Sadly, most of my "more evolved" texts are in Croatian.. If you visit the topic you'll see that I end up finding neurotransmitters which govern said abstract "approach" and "avoidance" schemes to be common to all nervous system in all animals. The "philosophy" behind is extremely sound and robust and makes good predictions at any level.
Anyhow, I can go all the way to human social evolution building on the same scaffold. My explanation is smooth from the inception of life to humans and their brain setup. My view of life is broader than any taught in any school, I arrived at it myself, I wasn't fed contemporary science. I have my own understanding of things and admittedly I do make many blunders when using terms that already have established meaning. I did teach myself programming without books or the internet(didn't really exist) at the age of 11 so you might wanna give my raw understandings a chance.
A species can increase fitness - which increases generation of variety through increased population growth - which increases adaptiveness.
A species can increase evolvability - which increases responsive generation of variety to circumstances and also enhances selection abilities - which increases "responsive adaptiveness" or "intelligent adaptiveness".
Adaptivenes ensures existence over time, ensures that the self-replicating schemas persist through time and circumstances. One can derive a "goal" of evolution from that - its simply to increase adaptiveness - meaning shortening the time it takes for adaptation. Since life is persisting of self-replicating schemas through time, one can understand evolution as a competition of life which increases self-replication (per time) and increases stability/survival (per time) -> two dimensions which generate the above explained targets of evolution - approach and avoid behavior. Evolution is a physical process as is the life course of a star, an increase in entropy. It is not simply random or whatever you imply it is.
For example, the development of the mammalian brain enabled adaptation through memes that can be replicated across mammalian brains via vicarious learning/observation or conditioning and so on. This fasttracked evolution of mammals as one can generate/permutate a variety of behavior to overcome some obstacle in a short period of time, apply it, detect success and start replicating the detected sucessfull behavior within its group enhancing the group. It would take reptiles generations and generations of DNA recombination try and fail to overcome the same obstacle. Time has proven that mammals for the most part are more adaptive (per time) than reptiles and mammals have pushed out reptiles in most habitats. The moments in which evolved "adaptiveness" becomes most apparent is after natural disasters that clear territories of life. Species (or clades) which are most adaptable spread into new ground first, establish a rule before "slower" species can do so.
If you include that not only genes are carriers of evolution (of self replicating behavior of matter) but so are "memes", humans ARE the most evolvable species on earth with no doubt or second thoughts about it. I don't see why this would offend any modern scientific theory?
When memes/mammalian brains are included as carriers of evolution - "evolvable" basically sublimates into "intelligent". And humans are the most intelligent of mammalian species.
The march of progress is the canonical representation of evolution – the one picture immediately grasped and viscerally understood by all.... The straitjacket of linear advance goes beyond iconography to the definition of evolution: the word itself becomes a synonym for progress.... [But] life is a copiously branching bush, continually pruned by the grim reaper of extinction, not a ladder of predictable progress.[3]
My understanding of the term evolution includes both - mutation (generation of variety) and selection (pruning/extinction). Evolution is not one or the other - it is both working together. It is noted so even in the old quote I dug up above. The above quote seems to imply that pruning is somehow unrelated to evolution or whatever?
To note - evolution is generation of variety of behavior, rather than just DNA variety. Evolution is also selection of behavior through pruning of the performers. Neither of the components can produce evolution by themselves. I never said it can be predicted, I actually think I said it can't. It doesn't mean it is random. We CAN conclude with utmost certainty that the mammalian brain allows few orders of magnitude faster adaptiveness than reptiles for most circumstances that can be imagined from exploring history. The typical mammalian body however has issues adapting to extreme heat and some other circumstances and can not follow reptiles everywhere. So being a mammal or human is not universally better than being a reptile. That was never the point. And it seems like the only thing you can read from all my texts, dunno why.
The continually pruned bush is in fact "honed" towards something - maximum adaptiveness as a whole an each of its branches and subbranches individually as well. The bush needs the reptiles to inhabit niches which mammals can't - this is the variety of the bush which increases total life robustness. Before mammals, reptiles inhabited all niches that now belong to mammals. So mammals are more evolved in a subset of circumstances, just not universally.
Increasing adaptiveness or simply put - intelligence is somehow physically related to (causal) entropy, but I can't begin to explain how in words but this article may give you an idea
http://phys.org/news...l-entropic.html
Interesting that you have a degree in evolutionary biology, I'd much rather talk about that than morals, no offense, it's just that I have so much research time invested in evolution and not so much in morals.
Regarding evolutionary biology I have never seen the components of approach and avoid described as the basic targets of evolution. These components are not just abstract targets of evolution, they are also easily visible from the way nervous systems are set up, they are concrete as well as explained in the thread I linked. Combining psychology and many read pharmaceutic studies of animals, a basic understanding of neurology, cybernetics and aritifical(or rather universal) intelligence is what brings my ideas together.
Also to note, some lamarckian ideas were not inherently incorrect. And darwin was puzzled by the lightning speed of evolution at some points in history. Science has yet to find means of transfering biologic adaptations that parents acquired during their life time to their progeny. Males are the source of 75% of mutations, their sperm is fresh and can contain traces of their circumstances, their bodies can decide to increase mutation of sperm DNA in response to the stress the male accumulated over time or recently and this probably is in part what generates the increasing number of autistic people and similar disorders. Lamarck wasn't wrong at guessing it does somehow happen, but not to the extent he imagined. Time will show. I had a few articles about recent findings that go against the modern idea that progeny can in no way genetically be affected by the experience of their parents. I can try and find the articles if you want. I remember that adaptations of the immune system can be passed to progeny. Bits of DNA that flow through the bloodstream and incorporate into germ cell DNA.
Edited by addx, 28 July 2015 - 10:05 PM.