... Biologists are now beginning to lay claims to universal knowledge, of what life is, how it em... more ... Biologists are now beginning to lay claims to universal knowledge, of what life is, how it emerged ... The dominant fashion for giving genetic explanations to account for many if not all as-pects of ... I offer an alternative vision of liv-ing systems which recognises the power and role of ...
... Biologists are now beginning to lay claims to universal knowledge, of what life is, how it em... more ... Biologists are now beginning to lay claims to universal knowledge, of what life is, how it emerged ... The dominant fashion for giving genetic explanations to account for many if not all as-pects of ... I offer an alternative vision of liv-ing systems which recognises the power and role of ...
... Biologists are now beginning to lay claims to universal knowledge, of what life is, how it em... more ... Biologists are now beginning to lay claims to universal knowledge, of what life is, how it emerged ... The dominant fashion for giving genetic explanations to account for many if not all as-pects of ... I offer an alternative vision of liv-ing systems which recognises the power and role of ...
... Large numbers of bacteria live as endosymbionts of other organisms in relation-ships of mutua... more ... Large numbers of bacteria live as endosymbionts of other organisms in relation-ships of mutual dependence, some of which are yielding their complexities to metagenomic investigation (eg Woyke et al., 2006; Robidart et al., 2008; Warnecke et al., 2007). ...
Comparative genomics and systems biology offer unprecedented opportunities for testing central te... more Comparative genomics and systems biology offer unprecedented opportunities for testing central tenets of evolutionary biology formulated by Darwin in the Origin of Species in 1859 and expanded in the Modern Synthesis 100 years later. Evolutionary-genomic studies show that natural selection is only one of the forces that shape genome evolution and is not quantitatively dominant, whereas non-adaptive processes are much more prominent than previously suspected. Major contributions of horizontal gene transfer and diverse selfish genetic elements to genome evolution undermine the Tree of Life concept. An adequate depiction of evolution requires the more complex concept of a network or ‘forest’ of life. There is no consistent tendency of evolution towards increased genomic complexity, and when complexity increases, this appears to be a non-adaptive consequence of evolution under weak purifying selection rather than an adaptation. Several universals of genome evolution were discovered including the invariant distributions of evolutionary rates among orthologous genes from diverse genomes and of paralogous gene family sizes, and the negative correlation between gene expression level and sequence evolution rate. Simple, non-adaptive models of evolution explain some of these universals, suggesting that a new synthesis of evolutionary biology might become feasible in a not so remote future.
... to its author, signals recognition of the importance of his symbio-genesis principle ... the ... more ... to its author, signals recognition of the importance of his symbio-genesis principle ... the advances in the literature since 1924 for specific cases of symbiogenesis to see ... From a Darwinian,selectionist position, Kozo-Polyansky (1923) aggressively criticized the orthogenetic the-ory ...
Evolutionary epistemology can provide a unified scientific methodology that enables scholars to s... more Evolutionary epistemology can provide a unified scientific methodology that enables scholars to study the evolution of life as well as the evolution of cognition, science, culture and any other phenomenon displayed by living organisms. In this article, three heuristics are provided that allow for a thorough search for the units, levels and mechanisms of evolution. Contrary to previous approaches, units, levels and mechanisms are not identified by pointing out essential features, but rather ostensive definitions are preferred. That is, units are considered as such if a level of evolution and a mechanism of evolution is identifiable. Levels are levels if one can point out units that evolve at that level according to evolutionary mechanisms, and mechanisms are considered as such if one can point out units and levels where the mechanism is active.
This article intends to continue our previous work on the symbiogenic approach to chemical and bi... more This article intends to continue our previous work on the symbiogenic approach to chemical and biological evolution. We believe that cooperative and synergistic processes were responsible, using terrestrial and extraterrestrial materials, for the creation of a large prebiotic pool, closely related to geochemical contexts, and intense interactions within. Probably, a series of synergistic and cooperative effects produced a wide source of creativity, and functional advantages that pushed the emergence of complex and functionally integrated biological systems, through the evolution of selforganization and auto-catalysis. It was only after this biochemical evolution of structures, which produced the informational capabilities necessary for self-replication, that the Darwinian mechanisms could arise. This way of perceiving the emergence of life follows the proposals regarding life's initial evolution in which the progenote proposed consisted in an open community of very diverse primitive cellular entities with intense symbiotic associations, antagonisms, and competition, and with a rapid and reticulate pattern of evolution. We believe this symbiogenic approach should be considered in the understanding of chemical and biological evolution. This discussion contributes to the development of astrobiological knowledge, since it gives other perspectives about life's appearance and development on Earth and elsewhere.
... Biologists are now beginning to lay claims to universal knowledge, of what life is, how it em... more ... Biologists are now beginning to lay claims to universal knowledge, of what life is, how it emerged ... The dominant fashion for giving genetic explanations to account for many if not all as-pects of ... I offer an alternative vision of liv-ing systems which recognises the power and role of ...
... Biologists are now beginning to lay claims to universal knowledge, of what life is, how it em... more ... Biologists are now beginning to lay claims to universal knowledge, of what life is, how it emerged ... The dominant fashion for giving genetic explanations to account for many if not all as-pects of ... I offer an alternative vision of liv-ing systems which recognises the power and role of ...
... Biologists are now beginning to lay claims to universal knowledge, of what life is, how it em... more ... Biologists are now beginning to lay claims to universal knowledge, of what life is, how it emerged ... The dominant fashion for giving genetic explanations to account for many if not all as-pects of ... I offer an alternative vision of liv-ing systems which recognises the power and role of ...
... Large numbers of bacteria live as endosymbionts of other organisms in relation-ships of mutua... more ... Large numbers of bacteria live as endosymbionts of other organisms in relation-ships of mutual dependence, some of which are yielding their complexities to metagenomic investigation (eg Woyke et al., 2006; Robidart et al., 2008; Warnecke et al., 2007). ...
Comparative genomics and systems biology offer unprecedented opportunities for testing central te... more Comparative genomics and systems biology offer unprecedented opportunities for testing central tenets of evolutionary biology formulated by Darwin in the Origin of Species in 1859 and expanded in the Modern Synthesis 100 years later. Evolutionary-genomic studies show that natural selection is only one of the forces that shape genome evolution and is not quantitatively dominant, whereas non-adaptive processes are much more prominent than previously suspected. Major contributions of horizontal gene transfer and diverse selfish genetic elements to genome evolution undermine the Tree of Life concept. An adequate depiction of evolution requires the more complex concept of a network or ‘forest’ of life. There is no consistent tendency of evolution towards increased genomic complexity, and when complexity increases, this appears to be a non-adaptive consequence of evolution under weak purifying selection rather than an adaptation. Several universals of genome evolution were discovered including the invariant distributions of evolutionary rates among orthologous genes from diverse genomes and of paralogous gene family sizes, and the negative correlation between gene expression level and sequence evolution rate. Simple, non-adaptive models of evolution explain some of these universals, suggesting that a new synthesis of evolutionary biology might become feasible in a not so remote future.
... to its author, signals recognition of the importance of his symbio-genesis principle ... the ... more ... to its author, signals recognition of the importance of his symbio-genesis principle ... the advances in the literature since 1924 for specific cases of symbiogenesis to see ... From a Darwinian,selectionist position, Kozo-Polyansky (1923) aggressively criticized the orthogenetic the-ory ...
Evolutionary epistemology can provide a unified scientific methodology that enables scholars to s... more Evolutionary epistemology can provide a unified scientific methodology that enables scholars to study the evolution of life as well as the evolution of cognition, science, culture and any other phenomenon displayed by living organisms. In this article, three heuristics are provided that allow for a thorough search for the units, levels and mechanisms of evolution. Contrary to previous approaches, units, levels and mechanisms are not identified by pointing out essential features, but rather ostensive definitions are preferred. That is, units are considered as such if a level of evolution and a mechanism of evolution is identifiable. Levels are levels if one can point out units that evolve at that level according to evolutionary mechanisms, and mechanisms are considered as such if one can point out units and levels where the mechanism is active.
This article intends to continue our previous work on the symbiogenic approach to chemical and bi... more This article intends to continue our previous work on the symbiogenic approach to chemical and biological evolution. We believe that cooperative and synergistic processes were responsible, using terrestrial and extraterrestrial materials, for the creation of a large prebiotic pool, closely related to geochemical contexts, and intense interactions within. Probably, a series of synergistic and cooperative effects produced a wide source of creativity, and functional advantages that pushed the emergence of complex and functionally integrated biological systems, through the evolution of selforganization and auto-catalysis. It was only after this biochemical evolution of structures, which produced the informational capabilities necessary for self-replication, that the Darwinian mechanisms could arise. This way of perceiving the emergence of life follows the proposals regarding life's initial evolution in which the progenote proposed consisted in an open community of very diverse primitive cellular entities with intense symbiotic associations, antagonisms, and competition, and with a rapid and reticulate pattern of evolution. We believe this symbiogenic approach should be considered in the understanding of chemical and biological evolution. This discussion contributes to the development of astrobiological knowledge, since it gives other perspectives about life's appearance and development on Earth and elsewhere.
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Papers by Lola Bejarano