Origine ed evoluzione dei genomi: dal brodo primordiale al DNA umano

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

[automatically translated] For a better understanding of the origin and evolution of genomes it is convenient to place the beginning and the course of this process within the sequence of changes that start from the origin of the universe and still can not, by definition , considered concluded. The Big Bang concludes the universal cosmic evolution and gives rise to planetary evolution the formation of solar systems and their planets. Considering our solar system, and Earth in particular, geothermal evolution, the cooling of the planet, provides a suitable physical condition to chemical evolution that, at the end, leading to the primordial soup. Simple molecules can clump together to form monomers of a polymer or polycondensate, fundamental basis for complex chemistry, the chemistry of life: Apart from the biochemical evolution with the first proto-RNA genomes with replicating properties and functions not only encoding but also the catalytic "ribozyme-like" type. The archeoatmosfera, greatly reducing, favored the emergence of ribonucleotide reduced, ie the desossiribonucleotide, and some proto-RNA molecules could replicate randomly also including deoxyribonucleotides. Through an evolutionary intermediate, the PNA, stretches to the DNA. Only enclosed macromolecules into confined spaces can be more effective and thus makes its way evolution phone with the appearance of the chromosomes. From this moment the cell, the fundamental unit of life is the protagonist of an evolution whose intermediate stages are still visible. The man, the son evolved pro tempore of the latter type of evolution, the biological, in turn is the protagonist of an evolution much more rapidly and in a short time by the visible effects, such as cultural. Very attractive is the combination of biological evolution with the computer recently and very quickly is establishing itself in the human world. Many similarities, the virus for example, show that the evolutionary processes proceed with a scheme-type that can not vary even to change the basic parameters, valid "from the cosmos to the byte". Computer viruses are semi-autonomous information, as are the biological ones, both are able to spread, both could be useful if properly "processed" but both are unable to live and spread a performer if divorced from the context of the information.
Original languageItalian
Title of host publicationQuaderni di Ricerca in Didattica
Pages66-71
Number of pages0
Publication statusPublished - 2011

Publication series

NameQuaderni di Ricerca in Didattica

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