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The life cycle and its evolution

Author: Alessandro Minelli
Edition/Format: Chapter Chapter : English
Summary:
To some extent, the evolution of multicellular organisms such as metazoans is the evolution of their cells, whose prototypical characters are frequently abandoned, as with syncytia or as a consequence of apoptosis. To explain the evolution of growth, cell differentiation, and morphogenesis, an adequate framework is provided by the intrinsic logic of these developmental processes which proceed, whenever challenged,  Read more...
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Details

All Authors / Contributors: Alessandro Minelli
ISBN: 9780198566205 9780191713866
Publication:Perspectives in Animal Phylogeny and Evolution; Oxford University Press
Language Note: English
Unique Identifier: 5104875898
Awards:
Other Titles: Chapter 7

Abstract:

To some extent, the evolution of multicellular organisms such as metazoans is the evolution of their cells, whose prototypical characters are frequently abandoned, as with syncytia or as a consequence of apoptosis. To explain the evolution of growth, cell differentiation, and morphogenesis, an adequate framework is provided by the intrinsic logic of these developmental processes which proceed, whenever challenged, according a principle of developmental inertia. Cell-cell competition can explain the origin of gametes, set-aside cells and germ layers, and the occurrence of morphostatic processes. Alternative views of the evolution of life histories regard either the whole life cycle or the individual developmental stages as legitimate units of evolution, but the latter views face difficulties with intrinsic problems of periodization of development. Animal larval types are surveyed, with a discussion of primary versus secondary origins of larvae and metamorphosis. The last section of the chapter deals with the role of genes in animal development.

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<http:\/\/experiment.worldcat.org\/entity\/work\/data\/1330734682#Person\/minelli_alessandro<\/a>> # Alessandro Minelli<\/span>\n\u00A0\u00A0\u00A0\u00A0a \nschema:Person<\/a> ;\u00A0\u00A0\u00A0\nschema:name<\/a> \"Alessandro Minelli<\/span>\" ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n
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<http:\/\/experiment.worldcat.org\/entity\/work\/data\/1330734682#Thing\/germ_layer<\/a>> # germ layer<\/span>\n\u00A0\u00A0\u00A0\u00A0a \nschema:Thing<\/a> ;\u00A0\u00A0\u00A0\nschema:name<\/a> \"germ layer<\/span>\" ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n
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<http:\/\/experiment.worldcat.org\/entity\/work\/data\/1330734682#Thing\/life_cycle<\/a>> # life cycle<\/span>\n\u00A0\u00A0\u00A0\u00A0a \nschema:Thing<\/a> ;\u00A0\u00A0\u00A0\nschema:name<\/a> \"life cycle<\/span>\" ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n
<http:\/\/experiment.worldcat.org\/entity\/work\/data\/1330734682#Thing\/morphostasis<\/a>> # morphostasis<\/span>\n\u00A0\u00A0\u00A0\u00A0a \nschema:Thing<\/a> ;\u00A0\u00A0\u00A0\nschema:name<\/a> \"morphostasis<\/span>\" ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n
<http:\/\/experiment.worldcat.org\/entity\/work\/data\/1330734682#Thing\/set_aside_cells<\/a>> # set-aside cells<\/span>\n\u00A0\u00A0\u00A0\u00A0a \nschema:Thing<\/a> ;\u00A0\u00A0\u00A0\nschema:name<\/a> \"set-aside cells<\/span>\" ;\u00A0\u00A0\u00A0\u00A0.\n\n\n<\/div>\n
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