منابع مشابه
Evolution without natural selection: further implications of the daisyworld parable.
Daisyworld is a model dynamical system in which very simple mechanisms interact to produce complex behaviour. It was devised to show how regulation can arise without natural selection. Here we investigate the model in greater detail. We analyse the possible steady states and study the response of the system under different conditions, we consider the implications of the hysteresis which is foun...
متن کاملAdaptation without Natural Selection
How can a system become better adapted over time without natural selection? Although some argue for ‘organismic’ properties such as robustness and self-sustaining regulation in non-evolved systems [1,5,11], others insist that natural selection is the only source of true adaptation [3]. We suggest that understanding how adaptation can occur without natural selection remains a fundamental open qu...
متن کاملEvolution by Natural Selection
The first published expression of the theory of evolution by natural selection was printed July 1, 1858, in the Journal of the Linnaean Society of London in the form of two essays: one by Charles Darwin and one by Alfred Russel Wallace. These two essays, along with Darwin's preliminary Sketch of 1842 and his Essay of 1844 (neither of which were published until 1909), and a foreword by Sir Gavin...
متن کاملNatural selection in chemical evolution.
We propose that chemical evolution can take place by natural selection if a geophysical process is capable of heterotrophic formation of liposomes that grow at some base rate, divide by external agitation, and are subject to stochastic chemical avalanches, in the absence of nucleotides or any monomers capable of modular heredity. We model this process using a simple hill-climbing algorithm, and...
متن کاملPhysics of Evolution: Selection without Fitness
Traditionally evolution is seen as a process where from a pool of possible variations of a population (e.g. biological species or industrial goods) a few variations get selected which survive and proliferate, whereas the others vanish. Survival probability is typically associated with the ’fitness’ of a particular variation. In this paper we argue that the notion of fitness is an a posteriori c...
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ژورنال
عنوان ژورنال: Nature
سال: 1885
ISSN: 0028-0836,1476-4687
DOI: 10.1038/033128e0