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Here we describe an experiment in which simple cooperating lineages of bacteria were propagated under a selective regime that rewarded collective-level persistence. Collectives reproduced via life cycles that either embraced, or purged, cheating types. When embraced, the life cycle alternated between phenotypic states. Selection fostered inception of a developmental switch that underpinned the emergence of collectives whose fitness, during the course of evolution, became decoupled from the fitness of constituent cells. Such development and decoupling did not occur when groups reproduced via a cheat-purging regime. Our findings capture key events in the evolution of Darwinian individuality during the transition from single cells to multicellularity.
originally posted by: GetHyped
a reply to: guitarplayer
Well obviously, it was a human experiment, after all. "Human help" for fire would be placing flammable material near a heat source. Does that mean that this is Intelligent Burning? Creationists are REALLY reaching with their denial, here.
originally posted by: Sabiduria
a reply to: guitarplayer
Unless you were there to observe it when it happened naturally in nature, you can't say for sure that it was intelligent design or not.
The term “explosion” may be a bit of a misnomer. Cambrian life did not evolve in the blink of an eye. The Cambrian was preceded by many millions of years of evolution, and many of the animal phyla actually diverged during the Precambrian.
The animals of the Cambrian did not appear out of thin air. Animal fossils from before the Cambrian have been found. Roughly 575 million years ago, a strange group of animals known as Ediacarans lived in the oceans. Although, we don’t know much about the Ediacarans, the group may have included ancestors of the lineages that we identify from the Cambrian explosion.
Evolution by natural selection is a two-step process, and only the first step is random: mutations are chance events, but their survival is often anything but. Natural selection favours mutations that provide some advantage (see Evolution promotes the survival of species), and the physical world imposes very strict limits on what works and what doesn't. The result is that organisms evolve in particular directions.
Moreover, random mutations have been observed that do improve the adaptiveness of the organism under certain conditions. From these observations, evolutionists have (unjustifiably) extrapolated to say that random mutations and natural selection can account for the development of life.
However, on both theoretical and experimental grounds, the broad sweep of evolution cannot be based on random mutations. On theoretical grounds, the probability is just too small for random mutations, even with the filtering of natural selections, to lead to a new species.
On experimental grounds, there are no known random mutations that have added any genetic information to the organism. This may seem surprising at first, but a list of the best examples of mutations offered by evolutionists shows that each of them loses genetic information rather than gains it.
One of the examples where information is lost is the one often trotted out by evolutionists nowadays in an attempt to convince the public of the truth of evolution. That is the evolution of bacterial resistance to antibiotics.
Clearly, if random mutations could account for the evolution of life, then those mutations must have added a vast amount of information to the genetic code. From the time of the first simple organism until the present profusion of life, billions of genetic changes would have to be built up by a long series of accumulated mutations and natural selection. It follows that each of these many billions of mutations must have added information. Yet in spite of all the molecular studies that have been done on mutations, not a single one has been found that adds any genetic information! They all lose information!
In the new study, the researchers looked at all of the DNA sequences under positive selection (or those that help an organism adapt to its environment), to see whether they were near a repeated sequence. They found that 97 percent of the sites were.
To find out if other DNA sequences that don't undergo positive selection also mutate in this way, Garvin identified all of the repeated sequences in the DNA of the species studied. He found that 60 percent of all mutating sites were next to a repeat.
"So in the end, most mutation is not random, at least for the DNA sequences we analyzed here," Garvin said. Rather, it is a combination of two opposing forces — the mis-pairing during DNA replication and the need to preserve a protein's function, Garvin said.
The findings could explain why evolution occurs much faster than if mutations were, in fact, totally random, the researchers said. The repeated sequences may also be necessary for evolution, they said.
For example, genetic diversity at these DNA sites could help species adapt to changes in the availability of food and other resources that can result from climate change, Garvin said. So these repeat sequences could be used as a predictor for how a population will respond to environmental changes
At the opposite end of the scale, natural selection is sometimes interpreted as a random process. This is also a misconception. The genetic variation that occurs in a population because of mutation is random — but selection acts on that variation in a very non-random way: genetic variants that aid survival and reproduction are much more likely to become common than variants that don't. Natural selection is NOT random!
originally posted by: guitarplayer
originally posted by: Sabiduria
a reply to: guitarplayer
Unless you were there to observe it when it happened naturally in nature, you can't say for sure that it was intelligent design or not.
Please explain to me the Cambrian explosion. Brand new species without any prior evolution. Where did all the new information come from to create new species? It was not evolution so what was it?