The zootype and the phylotypic stage
WebAnimal and plant development starts with a constituting phase called embryogenesis, which evolved independently in both lineages. Comparative anatomy of vertebrate development--based on the Meckel-Serrès law and von Baer's laws of embryology from the early nineteenth century--shows that embryos from various taxa appear different in early stages, converge … Web14 Jun 2010 · In one sense, we are simply shifting the concept of a common embryonic stage from one level of organization, the whole embryo, to a lower level of organization, the individual tissues and organs. By doing so, we suggest that molecular commonality of tissues and organs is stronger than the morphological commonality of the whole embryo …
The zootype and the phylotypic stage
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Web10 Feb 2012 · The phylotypic stage as a boundary of modular memory: non mechanistic perspective, Theory in Biosciences 10.1007/s12064-012-0149-0 DeepDyve Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You and Your Team. Learn More → The phylotypic stage as a boundary of modular memory: non mechanistic … Web11 Feb 1994 · The formation of the second midgut constriction requires the Ultrabithorax (Ubx) and abdominal-A (abd-A) homeotic genes and decapentaplegic (dpp), a gene encoding a member of the TGFβ family of proteins. We identified a 674 bp enhancer of dpp controlling its expression in the second constriction domain of the visceral mesoderm (parasegment …
Web10 Feb 2012 · The history of the concept, its validity and the nature of a putative memory will be discussed, which draws this into connotation with the idea of a memory activated throughout the development of the embryo. The concept of the phylotypic stage has been strongly integrated into developmental biology, thanks mostly to drawings presented by … Web10 Feb 2012 · The morphological structure of the vertebrate phylotypic stage (i.e. the pharyngula or tailbud stage) is characterized by the presence of the neural tube, …
Web10 Jan 2000 · During the radiations, selective loss or simplification may have been as creative a force as innovation. Finally, colony individuation may have been a unique historical event that imprinted the development of bilaterians as the zootype and phylotypic stage. Web1 Jan 1999 · Changes of this kind have little or no gross effect on the anatomy of the embryo; they are only phenotypically expressed, or readily detected, when amplified at later stages. The phylotypic stage, the developmental hourglass, modularity, and von Baerian divergence are reassessed in terms of these arguments.
Web1 Dec 2004 · The book begins with a lucid and well argued introduction by Scholtz that discusses approaches to evo-devo and emphasises the utility of a phylogenetic approach rather than the more typological ideas of bauplan and phylum that give rise the phylotypic stage and zootype concepts.
Webthe phylotypic stage not only as a defining platform for an individual body plan but also as a link of this body plan to the whole animal phylogeny. Does the phylotypic stage exist? … ariani klccThe phylotypic period is defined as a period of maximal similarity between species within a phylum, but a recent study compared the phylotypic period across different phyla to examine whether the same conserved periods during development have been maintained across deeper phylogenetic relationships. Levin et al. compared the developmental gene expression patterns among ten individuals from ten different animal phyla and found evidence for an inverse hourgla… balanz mediantWebAccording to the hourglass model, ontogeny is characterized by a starting point at which different taxa differ markedly from one another, followed by a stage of reduced … balanzoni barbara twitterWebonic stage, no one has cited any comparative data in sup-port of the idea. It is almost as though the phylotypic stage is regarded as a biological concept for which no proof is needed. This has led to many problems, not least of which is the lack of consensus on exactly which stage is conserved (Richardson 1995). The phylotypic stage in balanzin darioWeb15 Feb 2007 · This period is called the phylotypic stage. At this time in development, vertebrate embryos all express a suite of characters that are common to the entire vertebrate lineage: they have a... balanz mepWeb1 Sep 2006 · ], developmental stages shared by the species across entire phyla in spite of vast differences in the development and morphology before and after that stage, and coined the new concept of the zootype [ 10 ], a hypothetical ground plan for all bilaterian animals. balanz ingresarWebThe zootype and the phylotypic stage Slack, J. M. W. Holland, P. W. H. Graham, C. F. Abstract What is it that defines an animal? The definition provided here, made on the … ariani kurung